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yes that is a good size
a good size quad for an avrage sized 12 year old not a fat one is a 125cc for kids
depends on how "big" the four year old is
Depends on the size of the 10 year old.
Yes
ok that is a good size and you are lucky i have that size to also i am 12 years old
No.
About average
One size up from a ten year old boy. Or it can be one size down from a twelve year old.
7.5 or 7.63- Depends on shoes size but those are good sizes for that age.
Matthew Timmons is a 17 year old actor.
Depends on his/her height you can choose 3/4-size (if less than 5') or full size.