Adulthood
Adulthood is a quest you unlock after the Pirate and His Goddess quest. Adulthood will allow you to age your teenage sims to an adult. You will need a Swim Center, at least 3 sims, Park, and some sort of TV. It will take a lot of time but it is all worth it.
The Missions
1) Send a Sim to the Park
2) Rearrange Chess Board (30 minutes)
3) Hide in the Park Toilet (4 hours, but counts as completed instantly)
4) Bring a second Sim to the Park
5) Continue Playing Chess (5 hours)
6) Ridicule another Sim (1 hour 30 minutes)
7) Stare vacantly into the Park Fountain (1 day)
8) Dance to Electronica (music) in the Park (5 hours)
9) Have 3 Sims in the Park
10) Complain to a Sim (1 minutes)
11) Mock another Sim (1 hour 30 minutes)
12) Grill Em All on the BBQ (8 hours)
13) Call a Sim to the Swim Center
14) Use the Slide (20 seconds)
15) Drink an Energy Drink at the Swim Centre (30 minutes)
16) Ridicule the Trophy Case (1 day)
17) Send a Sim Home
18) Watch the News (star level dependent 3-5 minutes)
19) Confess to a Sim (1 hour 10 minutes)
20) Clean up Trash (16 hours)
21) Have 5 Sims dance to a Park Stereo (5 hours but counts as completed immediately)
Rewards
Complete “Adulthood” within six days after starting it to unlock the Fashion Pack for your adult Sims. These new outfits are available in the Salon or when creating a Sim.