Andre Agassi is one of those rare men who is very good looking despite balding. He's just got the looks and the head shape to pull it off. He's very lucky.
He looked good with his long hair, which was kind of his trademark, but he looks excelent now, too. And he's married to the hot Steffi Graf, so obviously the guy isn't hurting.
Some established actors can't get HT"s because it would be obvious. Many others, like Joe Peschi, Jason Alexander, Robert DeNiro, etc. use hairpieces, etc. when they are in different roles. James Garner does this, so does Dennis Hopper. Many others, too, that don't come to mind right now.