Answer:
There was a girl half my age when I was 12, now I am 66, how old is she?
I am lighter than air but a hundred people cannot lift me. Careful! I am fragile!
I save lives on the ground and in the air
People buy me to eat but never eat me. What am I?
I have a neck and no head, two arms but no hands. I'm with you to school, I'm with you to work. What am I?
The answer I give is yes, but what I mean is no. What was the question?