Tripper McCarthy is one of them. He says it's never too early to plan ahead for what happens after your heart stops.
"You don't know how long you have," he said. "So I thought it was really important to look into these matters and to look into cryonics while we still had the chance 'cause you really don't know how much you're gonna get out of life, how much life you're gonna have. So yeah, we're in our early thirties but who's to say, you know, how long we'll live?"
His wife, Venus, says she thought her husband was "nuts" until she learned more about the process.
"When he explained to me the science behind it, and the people involved in the procedures, I really became a believer," she said. "And that's when I said that you know, I want to do it with you."
Dean Malkemus and his wife, Shannon, have made cryo-preservation a family matter. They're preserving themselves, as well as their three children.
"After becoming a mother, it really made me feel like it was a good thing to do," she said.
The oldest of their children, 9-year-old Avianna, has only an idea of what cryonics is, but is already sure she wants to be preserved.
"Yeah, 'cause it's better to have a chance than no chance coming back."
And it seems that's the viewpoint of most cryonics advocates, including McCarthy.
"The way I look at it is that cryonics is like the ultimate lottery ticket," he says. "If it does work, what you get … ... this extra life in the future, is just incredible. It'll mean more than any jackpot you could win today."