This was someone else's description of how she got involved in cryonics, as best I can remember it, and it was pretty much typical for the younger generation:

"When I was a very young girl, I was watching TV, and I saw something about cryonics, and it made sense to me - I didn't want to die - so I asked my mother about it. She was very dismissive, but tried to explain what I'd seen; and we talked about some of the other things that can happen to you after you die, like burial or cremation, and it seemed to me like cryonics was better than that. So my mother laughed and said that if I still felt that way when I was older, she wouldn't object. Later, when I was older and signing up for cryonics, she objected."

Click.

It's... kinda frustrating, actually.

There are manifold bad objections to cryonics that can be raised and countered, but the core logic really is simple enough that there's nothing implausible about getting it when you're eight years old (eleven years old, in my case).