I mean when you are viewing questions you can sort other peoples questions in to age range, so you only see questions from people of the age range you choose. Not limit or set the age range of people who can answer your own question.
Yeah, I guess I could use the option if they added it. I mean I try to only answer questions by people around my age group. Yes, that category is just labeled 'under 18', but most of the problems or questions are quite similar and I feel like I can help out with ease.