His hair looks grey in recent appearances...I think there is a bald spot on top that isn’t very well covered up. Years ago - probably when he FIRST ran, there was a video - real one, not a joke - on just HOW he parted and combed his hair. It disappeared long ago.
Trump would look younger in crew cut hair. Senator Lee of Utah looks younger with very short hair. Trump has large bald areas on head, and it looks weird trying to cover up those. There is no stigma for a man to get bald at age 78.