diff --git a/src/fellchensammlung/tools/misc.py b/src/fellchensammlung/tools/misc.py
index 72331eb..c3ab94b 100644
--- a/src/fellchensammlung/tools/misc.py
+++ b/src/fellchensammlung/tools/misc.py
@@ -15,6 +15,7 @@ def age_as_hr_string(age: datetime.timedelta) -> str:
     months = age.days/30
     years = age.days/365
     if years >= 1:
+        months = months - 12*years
         return f'{years:.0f} Jahr{pluralize(years)} und {months:.0f} Monat{pluralize(months)}'
     elif months >= 3:
         return f'{months:.0f} Monat{pluralize(months)}'