Pretty sure extended lifespan isn't one of his powers. He'd be almost 100 years old in 2099 (he was a teen in the 1970s, which must be at least 10 years ago in-universe since the Fantastic Four's 1961 origin is 15 years ago, so he was born in the early 2000s as things stand). Even if he was still alive he'd surely be in no fit state to still be Nova.