Dora the Explorer is 8 years old on August 15th 2010. She has been on television for 10 years now.
They are twins!
yes
His name is Diego. Yes, he is the cousin of Dora. In one of the episodes Dora says "We'll be going on an adventure with my cousin, Diego."
Dora's around age 11-12 she's in the 6th grade supposedly