UK here, 42 years not dead, and my pension plan in my 20s as I started work after University, and most of my 30s too, was to not live long enough to need a pension¹.

I don't think it was anything I thought about at all as a teenager though, nor that teens (or very early 20s) today have it so much in mind. Those I know are far more concerned about being able to afford housing and other essentials² now, pensions are something they can't really plan for until they have some income left after paying for those things.

[1] in pursuit of that plan I invested heavily in alcohol

[2] food, fuel, ...