Yes, in shuls where it is ever given to children, it should never be given to anyone over bar mitzva. If there is no child to do it, the gabbai should do it himself.
If you are davening in such a shul, and are not a child, and are asked to do gelillah, it is appropriate to refuse, and such is the minhag of the rabbonim and talmidei chachomim that they never do gelillah in such shuls.
I did gelillah in shul at mincha yesterday. I was asked to do hagbah, and refused because I didn’t know if it was heavy, and I save my strength for battling people on the CR.