How old do you have to be to be on barney and friends?

Selena Gomez was 7 years old on Barney and Friends

so this has happened to me once. I think this will help. So um you just come up to them and talk about Ur past memories. hope i helped.

Baby Bop

5th grade.

Selena Gomez was 7 yrs. old when she auditioned for barney.