Is it weird for a freshman to date upperclassmen?

I'm a freshman and I've never dated before but a lot of the guys I like are older than me and I don't really see anything wrong with that. My friends all think it's weird to date a junior or senior and say dating a senior is illegal cuz they're (mostly) 18. The way I see it, there's only a 3-4 year difference so it's ok but what does an upperclassman think about freshmen? Do I have any chance or is it a total turnoff?
Is it weird for a freshman to date upperclassmen?
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