Yeah but why does this only apply to people born before the 80s? I've never seen a 20-something in the 2000s and beyond who looked 40+, not the way I've seen older people when they were young. I blame leaded gasoline.
You haven't been looking hard enough, and hollywood doesn't cast them anymore. I work with someone who is 23 and looks like she's 38, I expect she's going to look the exact same age for the next 25 years.
Hair cuts and clothing also make a huge difference. They had her dressed like a late 80s mom.