I think Elon Musk looks his age, and looks pretty ok for a 49 year old. Granted he has money, and he's had hair transplants, but I've seen many late 40s early 50s people in much worse shape.
See: US presidents before-and-after vs corporate CEOs
Compared to his earlier pictures, it looks like he 'filled out' in terms of mody mass and skull growth. That sometimes happens when you take GH for long periods.