Mature

(nur) für Erwachsene

(suitable for adults only)

ausgereift

(brought to a state of complete readiness)

gereift

(fully developed)

reif

(fully developed)

reiflich

(profound; careful)

fällig werden

(to reach the date when payment is due)

reifen

(to become mature; to ripen)

reifen lassen

(to make (something, e.g. fruit) ripe or mature)