[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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