Steak is fine up to about medium. Medium / well at the extreme.
Past that, it dries out and you may as well order beef jerky.
When I grill steaks, they never go past medium. Just my opinion
they retain more flavor that way.

Dad is one of those folks who absolutely refuses to eat steak
that has any pink in it. Thus, I steer him towards a medium
cooked aged steak. Aged beef is grey in color anyway, thus
no pink