Possible reason why Sledge and Crew didn't age 65 million years
 

Maybe Sledge's crew were stuck in some type of time warp were time moved much slower, so to them it only felt like a couple years

Re: Possible reason why Sledge and Crew didn't age 65 million years
 

Maybe, they were placed in a deep freeze which put them in a coma that kept them from aging while they were in this deep freeze. ;)