many individual miners are probably in their 20s or lower 30s at that oldest
Don't kid yourself.
I've mined for years and I'm 66 years old.
As soon as I need to put the heat back on, I'll be firing up the ASICs again.
Wow maybe you are already dead when btc takes of.
Kiddin..
LOL That's what I told the chick down at Decentral when I bought a couple more coins yesterday.
Hopefully I'll never have to sell any of my coins (just spend what I must) and my nieces and nephews will inherit them all.
I certainly don't expect to be starving on my old age pension when I'm in my 80s and 90s.
I want to be able to hire and fire my own caregivers if I need them.
Fuck the nieces and nephews ( I don't mean literally). Use your BTC profits to live it up in your old age and to use up all your money.. you don't need to support any heirs...
However, if it happens to be that you kick the bucket before you spend every last penny of your money, then so be it.. those little likely to be undeserving snot noses can have whatever is left.