No, you can only adopt NPCs from a pool given by the game.
You are able to adopt teens but you'll need to rename them, maybe alter them in CAS afterwards with the edit in cas cheat so they can look like you wanted them to but you can't adopt existing Sims you made.
To get to the full edit mode in CAS with an existing sim (the adopted teen in this case)
Press CTRL+SHIFT+C all at the same time while in live mode.
Type TESTINGCHEATS ON
Press ENTER
Type CAS.FULLEDITMODE
Press ENTER
SHIFT+CLICK on the sim
Choose EDIT IN CAS
Make your desired changes to the sim then, click the check mark to exit CAS and return to the game.
Press CTRL+SHIFT+C again if the cheat console is not still open.
Type TESTINGCHEATS OFF
Press ENTER
Press ESC to close the cheat console.
Actually, I think I'm wrong. You can only adopt children and babies.
I need to doublecheck.
You can adopt a child though and then immediately age-up with the birthday cake, then take to CAS with the cheat.
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