This quest came with the All Grown Up update!
Wanting to complete every part of the family? You can now! Embark on a quest to save Simanity from Gullzilla, make the best of the “perfect” day, and make up for your future regrets to unlock the final age milestone of your Sims’ lives! Completing this quest lets you unlock the final age milestone of your Sims’ lives! (Warning: Age your Sims carefully – you cannot turn your Sims back into adults)
Requirements: Level 21
Unlocks: Age your Adult Sims into Senior/Elderly Sims; Bingo Hall.
Limited Edition: Exercise Machines
LE Expiration: January 29th!