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A collection of some classic Lemmy memes for your enjoyment
There are already a lot of good answers but I want to highlight this. Chronic tobacco smoke causes increased aging due to multiple mechanisms. Moreover, environmental tobacco exposure from second hand and third hand smoke prior to the 1990s was MASSIVE. So even if you didn’t smoke you got insane daily exposures to the same chemicals.
This is also why gen z is looking so old vape.
I don't see any links to Vsauce's video on this so I'm going to assume every response is wrong. TLDR: Styles become associated with eras and people in those eras become associated with our perception of that age bracket.
Lower testosterone is probably a big part of it. Look at 23 or 24 year old enhanced bodybuilders. they look like theyre 35. For whatever reason peoples T levels have been going down about 1 percent per year for the last 50 years. Its bound to have an effect.