Is it weird...?

I️ am 21 and my boyfriend is 22. He graduates school in July and I️ do in May. He knows once he gets a job he’s going to pop the question. He talked about getting me a promise ring in the meantime...is it pointless or weird that we’re kinda older to be getting a promise ring? Most people I️ know only did that in high school, but I’m curious as to what the rest of y’all are thinking