Completing the Teenagers Quest will allow you to Age your pre-teen Sims into teens.
There is no time limit on this Quest.
Here we will take you through all the steps in this Quest, and explain in more detail any which may be a little awkward or difficult.
Be Nice to Osiris - 1 min
Just as you would with any other Sim, get a SIm in the same room as the Alien, select the alien and choose the Be nice option.
Grow Onions - 7 hours
Select a garden patch and choose the onions. This takes 7 hours!
Be nice to Osiris - 1 min
Read the Big Book of Stuff - 24 hours
Select a bookcase (If you don't have you, can you buy one from the Home Store) and select the Big Book of Stuff opion - this takes a whole day!
Watch a Movie Marathon - 9 hours
Tap on a TV - Again if you don't have one, they can be purchased from the Home Store, and select watch movie marathon.
Bake Chocolate Pudding - 2 hours
Select an oven, choose the Baking option and scroll down until you see Chocolate Pudding - Bake that.
Talk to a Tree on a Housing Lot - 5 hours 30 mins
Quite simple - but quite strange... Simply select any tree in a garden and there will be a Talk to Tree option.
Grow Potatoes - 2 hours
Same process as grow onions a bit earlier on but with potatoes....
Be Nice to Osiris - 1 min
If he's still hanging around, great, if not, you can whistle for him in the Sim Menu and he shoudl arrive, else turn your game off then on again.
Be Inconspicuous on a Park Bench - 2 min 42 secs
Select the Park from The Town Map, whistle for a Sim to come, select a park bench and choose the Be Inconspicuous option.
Bake a Birthday Cake - 24 hours and 5 LP
As with any aging process you'll need a birthday cake, so select an oven, choose Baking and scroll down unilt you see the Birthday Cake
And that's it, you now can Age your pre-teens into Teens - Watch out!!!
You can also adopt teenaged Sims using the telephone.