Guys, why do older guys staring so much lately?

Anonymous
I'm 16 about to be 17, a lot of older guys legit stare at me and don't care if I catch them. This teacher in my school (he's maybe 35) stares into my eyes, and today he turned around and just stared at me like what the? and there's another guy everyone finds attractive, he'll be talking to guys his age (40) and just stop and stare at me like wtf, and yes he checks me out too, I felt so uncomfortable in shorts he just stared at my face then legs over and over. And another guy (43) legit talked to me around a supermarket and timed us leaving together like wtf? Do they not get I'm 16?
Guys, why do older guys staring so much lately?
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