diff --git a/CHANGELOG.md b/CHANGELOG.md
index 859e9f7..e718c51 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@
 Fixes: 
 
 - Small and Big Male Genitalia had images wrong way round 
+- Fertilin should activate at a MinAge of 18 
+
 
 # 1.1.0 (2023-03-04)
 
diff --git a/Common/Defs/GeneDefs/GeneDefs_LifeForce.xml b/Common/Defs/GeneDefs/GeneDefs_LifeForce.xml
index cc70eae..e8987d0 100644
--- a/Common/Defs/GeneDefs/GeneDefs_LifeForce.xml
+++ b/Common/Defs/GeneDefs/GeneDefs_LifeForce.xml
@@ -19,6 +19,7 @@
 		<selectionWeight>0</selectionWeight>
 		<displayCategory>rjw_genes_fertilin</displayCategory>
 		<displayOrderInCategory>-2</displayOrderInCategory>
+    	<minAgeActive>18</minAgeActive>
 		<customEffectDescriptions>
 		  <li>Gives fertilin supply.</li>
 		</customEffectDescriptions>
@@ -43,6 +44,7 @@
 		<prerequisite>rjw_genes_lifeforce</prerequisite>
 		<resourceLossPerDay>0.15</resourceLossPerDay>
 		<displayCategory>rjw_genes_fertilin</displayCategory>
+    	<minAgeActive>18</minAgeActive>
 		<displayOrderInCategory>-1</displayOrderInCategory>
 		<biostatCpx>1</biostatCpx>
 		<biostatMet>6</biostatMet>