Kinda weird ? mostly for guys unless girls would know?

Ok so i have 2 guys tellin me things one of them is still a teenager and tryin to tell me that his manhood is 11" which im thinkin yeah right to and another guy who is alot older(not like an old man GROSS) who i trust not to lie way more says hes is about 6 1/2. What would be about average, if there is an "average"?