Based on my picture, how old do I look?
A lot of people tell me I look this one certain age without my makeup on, so tell me, how old do you think I look?
Attention whoring away ;) lol
I'm weird in that I think it is insulting to underestimate an individual's age, whereas it is complimentary to overestimate. Thus, if I said that you appeared to be, say, 45, I'd be lauding you tremendously, whereas to say that you were in your sixteenth year would be a huge insult.
Thus, I'll go with twenty-one. Probably an overestimate, but no point in being insulting.