I never before realized how naive children are when it comes to the concept of age...and let me tell you, it is quite entertaining to hear them attempt age guesses!
As a substitute teacher, I am a small mystery. I am the "cool" person, the "new" teacher to get to know, and one of the first questions (other than "are you married" and "do you have kids") is "how old are you?"
When asked, I simply smile, shrug my shoulders, say "guess," and let the games begin.
Kindergarteners and 1st graders are the most entertaining because, with complete seriousness, they begin with "14" or "76". I try not to laugh out loud, but sometimes I can't control myself. They have no real concept of age...it's not their fault. When I tell them that isn't my age, some proceed to go even higher or lower! In their eyes, I have been seen as young as 11 and as old as 92. Awesome.
Third and fourth graders are a little more forgiving...but not completely on target, either. They peg me as in my 30s and occasionally in my 40s. I asked one class why they guessed so old (I mean, do I look that old??) and they said that they guessed those ages because that is the age of their parents. When they realized they guessed too old, they immediately dropped to 18. Gee, thanks.
Today, I actually had a sixth grade class that, despite the one guess of 18, got my age correct pretty quickly.
Lesson learned? If you need some "age therapy", talk to kids under the age of 10...chances are, they will make you feel young if you are old and old if you are young, which will probably make you feel pretty good about yourself.