Are you asking because you watched [this week’s vsauce](https://www.youtube.com/watch?v=vjqt8T3tJIE) on precisely this topic and still don’t understand, or because you happen to have not seen the video and are wondering by coincidence? Because vsauce covers it pretty well.
We identify older fashions and styles with older people, because those people tended not to change with the times. So if we see a young person with those fashions and styles we think of them as older.
[This Vsauce video](https://m.youtube.com/watch?v=vjqt8T3tJIE) isn’t about people in 1990, when you mentioned, but in the 40s and 50s. If you think young adults from the he 1990s look older than their modern counterparts, it’s probably your perception of things like fashion. I remember someone once telling me she thought Adele looked really really old (Adele was 20) and it was based on her style of clothing and hair.
You can also try this article from [IFL Science](https://www.iflscience.com/why-did-people-look-older-in-the-past-64432)
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