Why would you do that though? The point of investing is to build up wealth to enjoy at the later stage of your life. But if you're already at the late stage of life, investing for the long term makes little sense. There's a time to chase money and there's a time to slow down and relax.

That's unless you want to build generational wealth to pass down your bloodline, but that kind of thinking is rather rare for the baby boomer generation. And even if, at the age of ~80 your kids are probably mature enough to manage the family capital themselves.

So sure, there's nothing wrong in introducing older people to Bitcoin, but making them buy it as a long-term hold is not a great idea.