Well I'm on the borderline at exactly 35, however here's my thoughts...

Without the beard he looks kinda like a young Telly Sevalis so if he wants that kinda look then keep it,

however...

With the beard does make him look very very very slightly older (which I happen to like better even when I was under 35 lol) and makes him look more personable and friendly, but that part could also be the difference in the clothes and smile between the two pix.

I guess it's up to him, he can always shave or grow it back whenever he wants to if he doesn't like the look.