Is it inappropriate to date a significantly younger guy?

I am 25 and I am a college student. I have worked before and just started university this year. There is this guy I met in college, he is 19 and he likes me a lot. I know that he will transfer university in a year so he will move far away, so if we did get into a relationship it would not be forever I think. I am developing a crush on him too but I‘m unsure if this is okay because of our age gap?

Is it inappropriate to date a significantly younger guy?
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