>>12399177It depends on the image they want to show.
If they want to appear young, active, disciplined, professional and everything that their image advisers told them they shave to the bone if needed. If instead, they cannot hide they old, they will grow a dark, thick well groomed beard that hides their age but still makes them look experienced, seasoned profesionals.
I don't know if you were looking for a scientific answer the kind evolutionary psychologists like to say like "it shows testosterone levels are high and therefore he is a good leader to follow and should impregnated as many women as possible" because evolutionary psychology is hands down retarded and composed of a collection of anecdotes and out of context genetics.