diff --git a/7t_trt/participants.json b/7t_trt/participants.json
index a0c05a7fe..3e52e589a 100644
--- a/7t_trt/participants.json
+++ b/7t_trt/participants.json
@@ -16,7 +16,7 @@
   },
   "age_at_first_scan_years": {
     "LongName": "age_at_first_scan_years",
-    "Units": "years"
+    "Units": "year"
   },
   "handedness": {
     "LongName": "Edinburgh Handedness Inventory",
diff --git a/ds000246/participants.json b/ds000246/participants.json
index 56b24a593..80d085716 100644
--- a/ds000246/participants.json
+++ b/ds000246/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "Sex of the participant",
diff --git a/ds000247/participants.json b/ds000247/participants.json
index 56b24a593..80d085716 100644
--- a/ds000247/participants.json
+++ b/ds000247/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "Sex of the participant",
diff --git a/ds000248/participants.json b/ds000248/participants.json
index de061dfc2..3dbfd7898 100644
--- a/ds000248/participants.json
+++ b/ds000248/participants.json
@@ -4,7 +4,7 @@
     },
     "age": {
         "Description": "Age of the participant at time of testing",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "Biological sex of the participant",
diff --git a/ds001/participants.json b/ds001/participants.json
index bb34c6e01..ab39814f5 100644
--- a/ds001/participants.json
+++ b/ds001/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "Sex of the participant",
diff --git a/ds002/participants.json b/ds002/participants.json
index bb34c6e01..ab39814f5 100644
--- a/ds002/participants.json
+++ b/ds002/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "Sex of the participant",
diff --git a/ds003/participants.json b/ds003/participants.json
index bb34c6e01..ab39814f5 100644
--- a/ds003/participants.json
+++ b/ds003/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "Sex of the participant",
diff --git a/ds005/participants.json b/ds005/participants.json
index bb34c6e01..ab39814f5 100644
--- a/ds005/participants.json
+++ b/ds005/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "Sex of the participant",
diff --git a/ds006/participants.json b/ds006/participants.json
index bb34c6e01..ab39814f5 100644
--- a/ds006/participants.json
+++ b/ds006/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "Sex of the participant",
diff --git a/ds007/participants.json b/ds007/participants.json
index bb34c6e01..ab39814f5 100644
--- a/ds007/participants.json
+++ b/ds007/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "Sex of the participant",
diff --git a/ds009/participants.json b/ds009/participants.json
index d5120b33c..d681a82f0 100644
--- a/ds009/participants.json
+++ b/ds009/participants.json
@@ -1,7 +1,7 @@
 {
   "Age": {
     "LongName": "Age",
-    "Units": "years",
+    "Units": "year",
     "TermURL": "http://purl.obolibrary.org/obo/PATO_0000011"
   },
   "Gender": {
diff --git a/eeg_cbm/participants.json b/eeg_cbm/participants.json
index 7346eb4dd..b650e32df 100644
--- a/eeg_cbm/participants.json
+++ b/eeg_cbm/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "sex of the participant",
diff --git a/eeg_ds003645s_hed_demo/participants.json b/eeg_ds003645s_hed_demo/participants.json
index 66babf846..72a21f036 100644
--- a/eeg_ds003645s_hed_demo/participants.json
+++ b/eeg_ds003645s_hed_demo/participants.json
@@ -17,7 +17,7 @@
   },
   "age": {
     "Description": "Age of the subject",
-    "Units": "years",
+    "Units": "year",
     "HED": "Age/#"
   }
 }
\ No newline at end of file
diff --git a/eeg_ds003645s_hed_library/participants.json b/eeg_ds003645s_hed_library/participants.json
index 4fbcc432d..a262af9ca 100644
--- a/eeg_ds003645s_hed_library/participants.json
+++ b/eeg_ds003645s_hed_library/participants.json
@@ -12,6 +12,6 @@
   },
   "age": {
     "Description": "Age of the subject",
-    "Units": "years"
+    "Units": "year"
   }
 }
\ No newline at end of file
diff --git a/eeg_matchingpennies/participants.json b/eeg_matchingpennies/participants.json
index a962e16a6..b74959571 100644
--- a/eeg_matchingpennies/participants.json
+++ b/eeg_matchingpennies/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "handedness": {
         "Description": "handedness of the participant as reported by the participant",
diff --git a/eeg_rishikesh/participants.json b/eeg_rishikesh/participants.json
index 941c1cb30..885af0e40 100644
--- a/eeg_rishikesh/participants.json
+++ b/eeg_rishikesh/participants.json
@@ -11,7 +11,7 @@
   },
   "age": {
     "Description": "age of the participant",
-    "Units": "years"
+    "Units": "year"
   },
   "group": {
     "Description": "group, expert or novice meditators",
diff --git a/emg_ConcurrentIndependentUnits/participants.json b/emg_ConcurrentIndependentUnits/participants.json
index 9a6f51b13..417ea30ef 100644
--- a/emg_ConcurrentIndependentUnits/participants.json
+++ b/emg_ConcurrentIndependentUnits/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age in years",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "self-reported sex, one of M, F, or O",
diff --git a/emg_CustomBipolar/participants.json b/emg_CustomBipolar/participants.json
index 9a6f51b13..417ea30ef 100644
--- a/emg_CustomBipolar/participants.json
+++ b/emg_CustomBipolar/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age in years",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "self-reported sex, one of M, F, or O",
diff --git a/emg_CustomBipolarFace/participants.json b/emg_CustomBipolarFace/participants.json
index 9a6f51b13..417ea30ef 100644
--- a/emg_CustomBipolarFace/participants.json
+++ b/emg_CustomBipolarFace/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age in years",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "self-reported sex, one of M, F, or O",
diff --git a/emg_IndependentMod/participants.json b/emg_IndependentMod/participants.json
index 9a6f51b13..417ea30ef 100644
--- a/emg_IndependentMod/participants.json
+++ b/emg_IndependentMod/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age in years",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "self-reported sex, one of M, F, or O",
diff --git a/emg_MultiBodyParts/participants.json b/emg_MultiBodyParts/participants.json
index 9a6f51b13..417ea30ef 100644
--- a/emg_MultiBodyParts/participants.json
+++ b/emg_MultiBodyParts/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age in years",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "self-reported sex, one of M, F, or O",
diff --git a/emg_Multimodal/participants.json b/emg_Multimodal/participants.json
index fe080df37..f7c71075f 100644
--- a/emg_Multimodal/participants.json
+++ b/emg_Multimodal/participants.json
@@ -1,7 +1,7 @@
 {
 	"age": {
 		"Description": "Age of the participant",
-		"Units": "years"
+		"Units": "year"
 	},
 	"sex": {
 		"Description": "Biological sex of the participant",
diff --git a/emg_TwoHDsEMG/participants.json b/emg_TwoHDsEMG/participants.json
index 9a6f51b13..417ea30ef 100644
--- a/emg_TwoHDsEMG/participants.json
+++ b/emg_TwoHDsEMG/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age in years",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "self-reported sex, one of M, F, or O",
diff --git a/emg_TwoWristbands/participants.json b/emg_TwoWristbands/participants.json
index 9a6f51b13..417ea30ef 100644
--- a/emg_TwoWristbands/participants.json
+++ b/emg_TwoWristbands/participants.json
@@ -1,7 +1,7 @@
 {
     "age": {
         "Description": "Age in years",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "self-reported sex, one of M, F, or O",
diff --git a/fnirs_automaticity/participants.json b/fnirs_automaticity/participants.json
index ec9bd3c2b..1bc62a40d 100644
--- a/fnirs_automaticity/participants.json
+++ b/fnirs_automaticity/participants.json
@@ -8,7 +8,7 @@
   },
   "age": {
     "Description": "age of the participant on the moment of participation",
-    "Units": "years"
+    "Units": "year"
   },
   "haircolor": {
     "Description": "hair color as described by the Fischer-Saller scale",
diff --git a/fnirs_tapping/participants.json b/fnirs_tapping/participants.json
index de061dfc2..3dbfd7898 100644
--- a/fnirs_tapping/participants.json
+++ b/fnirs_tapping/participants.json
@@ -4,7 +4,7 @@
     },
     "age": {
         "Description": "Age of the participant at time of testing",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "Description": "Biological sex of the participant",
diff --git a/genetics_ukbb/participants.json b/genetics_ukbb/participants.json
index a84f9c87a..3b73ba6b4 100644
--- a/genetics_ukbb/participants.json
+++ b/genetics_ukbb/participants.json
@@ -2,7 +2,7 @@
   "age": {
     "LongName": "age",
     "Description": "age of the participant",
-    "Units": "month"
+    "Units": "year"
   },
   "sex": {
     "LongName": "sex",
diff --git a/ieeg_epilepsy/participants.json b/ieeg_epilepsy/participants.json
index 543dff568..df70da3ee 100644
--- a/ieeg_epilepsy/participants.json
+++ b/ieeg_epilepsy/participants.json
@@ -2,7 +2,7 @@
     "age": {
         "LongName": "age",
         "Description": "age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "LongName": "sex",
diff --git a/ieeg_epilepsyNWB/participants.json b/ieeg_epilepsyNWB/participants.json
index 543dff568..df70da3ee 100644
--- a/ieeg_epilepsyNWB/participants.json
+++ b/ieeg_epilepsyNWB/participants.json
@@ -2,7 +2,7 @@
     "age": {
         "LongName": "age",
         "Description": "age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "LongName": "sex",
diff --git a/ieeg_epilepsy_ecog/participants.json b/ieeg_epilepsy_ecog/participants.json
index 543dff568..df70da3ee 100644
--- a/ieeg_epilepsy_ecog/participants.json
+++ b/ieeg_epilepsy_ecog/participants.json
@@ -2,7 +2,7 @@
     "age": {
         "LongName": "age",
         "Description": "age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "LongName": "sex",
diff --git a/ieeg_visual_multimodal/participants.json b/ieeg_visual_multimodal/participants.json
index 543dff568..df70da3ee 100644
--- a/ieeg_visual_multimodal/participants.json
+++ b/ieeg_visual_multimodal/participants.json
@@ -2,7 +2,7 @@
     "age": {
         "LongName": "age",
         "Description": "age of the participant",
-        "Units": "years"
+        "Units": "year"
     },
     "sex": {
         "LongName": "sex",
diff --git a/mrs_biggaba/participants.json b/mrs_biggaba/participants.json
index d039ecee0..524a655cf 100755
--- a/mrs_biggaba/participants.json
+++ b/mrs_biggaba/participants.json
@@ -11,6 +11,6 @@
   },
   "age": {
     "Description": "Age of the participant",
-    "Units": "years"
+    "Units": "year"
   }
 }
diff --git a/pet002/participants.json b/pet002/participants.json
index bb8c1e2fa..866964291 100644
--- a/pet002/participants.json
+++ b/pet002/participants.json
@@ -16,7 +16,7 @@
   "age":{
     "LongName":"Age",
     "Description":"Age of the participant",
-    "Units": "years"
+    "Units": "year"
   },
   "gender":{
     "LongName":"gender",
diff --git a/pheno004/participants.json b/pheno004/participants.json
index 8408853fd..b4f79239c 100644
--- a/pheno004/participants.json
+++ b/pheno004/participants.json
@@ -11,6 +11,6 @@
   },
   "age": {
     "Description": "Age of the participant.",
-    "Units": "years"
+    "Units": "year"
   }
 }