This video from 1987 shows high school students having a good time at school, and generally going about their daily lives. Everything looks just as you would expect at a normal high school except for one thing... they all look old as f**k!
Just about every student looks like they could easily be in their mid 30s. While the hair and fashion choices certainly play a role in their perceived age, a trend we can see work the other way in the dress your mother challenge, not everything is superficial. I was a little skinny pipsqueak in high school, and most of you would be lying to me if you told me that you weren't. These kids are fully grown, and holding puberty firmly in their rear view mirrors.
No wonder so many adults call out modern kids for being immature. I suppose people really were built differently back then.