Sure, it would be a position that would be honorary until they are an adult because if something should happen to the parents the Godparent is suppose to take over the duties of parenting and a 13 year couldn't do that.
yes :)
the 11 yr old is a girl or a boy?
16 and 13 yr old daughters and 6 yr old son
No.
yes it is
It depends where you live and the local legislation.
I wouldn't recommend it for a 13 year old.
growth hormones.
Yes. digiromp.com
you don't
no
usually 7th or 8th grade