You answer the question from the previous person and then also post a new question for the next person to answer and so on.
"Example"
Q:How old are you?
Your reply,
A:I'm ___ years old.
And after your answer put a question for the next person,
Q:What kind of dog do you own?
So it would read like this,
A:I'm ___ years old.
Q:What kind of gun do you own?
__________________________________
Q: How old were you when you got your first deer?