diff --git a/src/worker/sql.rs b/src/worker/sql.rs
index 0ba0e97..7e8fd3d 100755
--- a/src/worker/sql.rs
+++ b/src/worker/sql.rs
@@ -2175,10 +2175,8 @@ pub const QUERY_GET_MARRIAGE_BIRTH_DELIVERIES: &str = r#"
         LEFT JOIN falukant_data.falukant_user fu2 ON fu2.id = c2.user_id
         WHERE r.marriage_pregnancy_due_at IS NOT NULL
           AND r.marriage_pregnancy_due_at <= NOW()
-          -- Eine fällige automatische Ehe-Geburt bleibt vorgemerkt, bis beide
-          -- Eltern mindestens 16 Spieljahre (Kalendertage) alt sind.
-          AND c1.birthdate <= CURRENT_DATE - INTERVAL '16 days'
-          AND c2.birthdate <= CURRENT_DATE - INTERVAL '16 days'
+          -- Das Fruchtbarkeitsalter wird bei der Konzeption geprüft.
+          -- Bestehende Schwangerschaften werden durch Backfills nicht blockiert.
           AND ((c1.gender = 'male' AND c2.gender = 'female')
                OR (c1.gender = 'female' AND c2.gender = 'male'))
           AND c_female.pregnancy_due_at IS NULL
@@ -2233,8 +2231,8 @@ pub const QUERY_TRY_MARRIAGE_CONCEPTION_UPDATE: &str = r#"
             LEFT JOIN falukant_data.falukant_user fu1 ON fu1.id = c1.user_id
             LEFT JOIN falukant_data.falukant_user fu2 ON fu2.id = c2.user_id
             WHERE r.marriage_pregnancy_due_at IS NULL
-              AND c1.birthdate <= CURRENT_DATE - INTERVAL '16 days'
-              AND c2.birthdate <= CURRENT_DATE - INTERVAL '16 days'
+              AND (CURRENT_DATE - c1.birthdate::date) >= c1.fertile_from_age
+              AND (CURRENT_DATE - c2.birthdate::date) >= c2.fertile_from_age
               AND ((c1.gender = 'male' AND c2.gender = 'female')
                    OR (c1.gender = 'female' AND c2.gender = 'male'))
               AND c_female.pregnancy_due_at IS NULL
@@ -2256,8 +2254,7 @@ pub const QUERY_TRY_MARRIAGE_CONCEPTION_UPDATE: &str = r#"
         conceivable AS (
             SELECT ma.relationship_id
             FROM mother_age ma
-            WHERE ma.mother_age_days >= 16
-              AND random() < ma.prob_year
+            WHERE random() < ma.prob_year
         )
           UPDATE falukant_data.relationship r
               SET marriage_pregnancy_due_at = NOW() + INTERVAL '18 hours'
@@ -2304,8 +2301,8 @@ pub const QUERY_GET_LEGACY_MARRIAGE_INSTANT_PREGNANCY_CANDIDATES: &str = r#"
             LEFT JOIN falukant_data.falukant_user fu2 ON fu2.id = c2.user_id
             WHERE ((c1.gender = 'male' AND c2.gender = 'female')
                OR (c1.gender = 'female' AND c2.gender = 'male'))
-              AND c1.birthdate <= CURRENT_DATE - INTERVAL '16 days'
-              AND c2.birthdate <= CURRENT_DATE - INTERVAL '16 days'
+              AND (CURRENT_DATE - c1.birthdate::date) >= c1.fertile_from_age
+              AND (CURRENT_DATE - c2.birthdate::date) >= c2.fertile_from_age
               AND c_female.pregnancy_due_at IS NULL
               AND NOT EXISTS (
                   SELECT 1
@@ -2338,8 +2335,7 @@ pub const QUERY_GET_LEGACY_MARRIAGE_INSTANT_PREGNANCY_CANDIDATES: &str = r#"
             mother_age_days,
             prob_year * 100.0 AS prob_pct
         FROM mother_age
-        WHERE mother_age_days >= 16
-          AND random() < prob_year;
+        WHERE random() < prob_year;
 "#;
 
 /// Spalten `pregnancy_due_at` / `pregnancy_father_character_id` auf `character` (Migration `011_…`).
@@ -3945,8 +3941,8 @@ pub const QUERY_GET_LOVER_PREGNANCY_CANDIDATES: &str = r#"
       -- `last_monthly_processed_at` wird im Familien-Tageslauf mitgeführt (1 Spieljahr = 1 Kalendertag).
       AND rs.last_monthly_processed_at IS NOT NULL
       AND rs.last_monthly_processed_at >= NOW() - INTERVAL '50 days'
-      AND c1.birthdate <= CURRENT_DATE - INTERVAL '16 days'
-      AND c2.birthdate <= CURRENT_DATE - INTERVAL '16 days'
+      AND (CURRENT_DATE - c1.birthdate::date) >= c1.fertile_from_age
+      AND (CURRENT_DATE - c2.birthdate::date) >= c2.fertile_from_age
       AND c_female.pregnancy_due_at IS NULL
             AND NOT EXISTS (
                     SELECT 1
@@ -3966,7 +3962,6 @@ pub const QUERY_GET_LOVER_PREGNANCY_CANDIDATES: &str = r#"
              AND cr.created_at::date = CURRENT_DATE
       )
       -- Ein Kalendertag entspricht einem Spieljahr (vgl. Ehe-Konzeption).
-      AND (CURRENT_DATE - c_female.birthdate::date) >= 16
       AND random() * 100.0 < (
           LEAST(12.0, GREATEST(0.0,
               CASE rs.lover_role
@@ -3991,12 +3986,12 @@ pub const QUERY_SET_CHARACTER_PREGNANCY_FROM_LOVER: &str = r#"
          WHERE c_m.id = $1::int
              AND c_m.health > 0
              AND c_m.pregnancy_due_at IS NULL
-             AND c_m.birthdate <= CURRENT_DATE - INTERVAL '16 days'
+             AND (CURRENT_DATE - c_m.birthdate::date) >= c_m.fertile_from_age
              AND EXISTS (
                  SELECT 1
                    FROM falukant_data.character c_f
                   WHERE c_f.id = $2::int
-                    AND c_f.birthdate <= CURRENT_DATE - INTERVAL '16 days'
+                    AND (CURRENT_DATE - c_f.birthdate::date) >= c_f.fertile_from_age
              )
              AND NOT EXISTS (
                      SELECT 1
@@ -4176,7 +4171,6 @@ mod tests {
     use super::*;
 
     const AGE_14_GUARD: &str = "birthdate <= CURRENT_DATE - INTERVAL '14 days'";
-    const AGE_16_GUARD: &str = "birthdate <= CURRENT_DATE - INTERVAL '16 days'";
 
     #[test]
     fn weddings_require_both_fiances_to_be_fourteen() {
@@ -4185,30 +4179,40 @@ mod tests {
     }
 
     #[test]
-    fn automatic_pregnancy_paths_require_both_parents_to_be_sixteen() {
+    fn automatic_conception_uses_each_parents_individual_fertility_age() {
         for query in [
-            QUERY_GET_MARRIAGE_BIRTH_DELIVERIES,
             QUERY_TRY_MARRIAGE_CONCEPTION_UPDATE,
             QUERY_GET_LEGACY_MARRIAGE_INSTANT_PREGNANCY_CANDIDATES,
             QUERY_GET_LOVER_PREGNANCY_CANDIDATES,
         ] {
-            assert_eq!(query.matches(AGE_16_GUARD).count(), 2, "{query}");
+            for parent in ["c1", "c2"] {
+                assert!(
+                    query.contains(&format!(
+                        "(CURRENT_DATE - {parent}.birthdate::date) >= {parent}.fertile_from_age"
+                    )),
+                    "{query}"
+                );
+            }
+            assert!(!query.contains("16 days"), "{query}");
+            assert!(!query.contains(">= 16"), "{query}");
+            assert!(!query.contains("5110"), "{query}");
+        }
+        for parent in ["c_m", "c_f"] {
+            assert!(QUERY_SET_CHARACTER_PREGNANCY_FROM_LOVER.contains(&format!(
+                "(CURRENT_DATE - {parent}.birthdate::date) >= {parent}.fertile_from_age"
+            )));
         }
-
-        assert!(QUERY_SET_CHARACTER_PREGNANCY_FROM_LOVER.contains(AGE_16_GUARD));
-        assert!(QUERY_GET_PLANNED_CHARACTER_BIRTH_DELIVERIES.contains("pregnancy_due_at <= NOW()"));
-        assert!(!QUERY_GET_PLANNED_CHARACTER_BIRTH_DELIVERIES.contains(AGE_16_GUARD));
     }
 
     #[test]
-    fn automatic_conception_uses_game_years_not_real_world_days() {
+    fn due_births_are_not_blocked_by_backfilled_fertility_ages() {
         for query in [
-            QUERY_TRY_MARRIAGE_CONCEPTION_UPDATE,
-            QUERY_GET_LEGACY_MARRIAGE_INSTANT_PREGNANCY_CANDIDATES,
-            QUERY_GET_LOVER_PREGNANCY_CANDIDATES,
+            QUERY_GET_MARRIAGE_BIRTH_DELIVERIES,
+            QUERY_GET_PLANNED_CHARACTER_BIRTH_DELIVERIES,
         ] {
-            assert!(!query.contains("5110"), "{query}");
-            assert!(query.contains(">= 16"), "{query}");
+            assert!(!query.contains("fertile_from_age"));
+            assert!(!query.contains("16 days"));
+            assert!(query.contains("<= NOW()"));
         }
     }