It is OK for guys to wear shorts.
Shorts are made for both men and women as wells a boys and girls.
There's no gender or age that you should stop wearing shorts.
I'm a guy and I wear shorts all the time in the summer and I could care less what anyone else thinks.
If you're comfortable wearing shorts you can and should wear shorts whether you're a guy, woman, boy or girl.
I see lots of guys out and about wearing shorts and they make and sell lots of men's shorts.
Some guys have issues with their legs being seen but there's nothing to worry about.
If someone thinks you look bad in shorts as a man then that is there problem and nobody else's business.
I would not worry about it and wear shorts when you feel comfortable.
Even some men police wear shorts when it's hot out.
Wear what you're comfortable wearing and forget about what other people think.
Dress how you want as well and if someone makes fun of you just ignore them.