Based on the clue 'at about age 15 a kid may graduate from summer cam...', what is the answer?

Based on the clue 'at about 63 there are more atoms of this element t...', what is the answer? What is associated with: at about 63000 ft at normal body temperature blood will do this? Based on the clue 'at about 7 million this iranian city is the middle...', what is the answer? What is associated with: at about 9 feet 1700 pounds this large bear shares its name with an alaskan island? What is associated with: at above 7000 feet this western hemisphere city had the highest altitude ever of a summer olym… Based on the clue 'at age 10 artist paolo uccello assisted this sculp...', what is the answer? Based on the clue 'at age 10 christian played winthrop paroo in a new...', what is the answer? Based on the clue 'at age 10 future new jersey governor christie whit...', what is the answer?