Years ago, the legendary Warren Moon played at 44 with the Kansas City Chiefs , and now, Philip Rivers will do that with the Indianapolis Colts after coming out of retirement.

However, Rivers' comeback worries Moon, who knows what it's like to go through the rigors of an NFL season at 44 years old. Unlike Moon, though, Rivers hasn't played recently. Moon played from 1978 to 2000. Rivers, meanwhile, has been out of action for five years .

Speaking to TMZ Sports, Moon talked about Rivers' comeback. He knows some veteran quarterbacks like former Colts signal-caller Joe Flacco are still slinging the rock in his 40s, but he's also been playing more consistently than Rivers.

“We've seen guys like Joe Flacco come back and do great coming out of retirement, but he wasn't in retirement v

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