Am I too old to have a school boy crush?

I’m an adult by every definition, but I was wondering…Can you ever be too old to have a ” school boy/girl” crush on someone? I mean you know the odds of something developing between you two are slim to none, but still you fancy them. Not driven by lust, but an innocent crush. To the point you secretly hope to see them, or plan what to wear in case you do..lol