I suppose that's what tends to happen! Don't think it'll miraculously grow back (unless artificially!!)
Unfortunately, yes, although what I find puzzling is that his hair generally doesn't seem to be getting thinner but looks the same as it always did, whereas Rafa is also getting a bit bald but his hair is getting noticeably thinner, which seems a bit more usual. It sounds like Andy could have a form of alopecia which might or might not be treatable, and there is a condition known as male pattern baldness, although that normally includes hair receding at the temples as well, but the only way to find out would be to consult a hair or skin specialist. Also he could consider a hair transplant, but maybe he doesn't want to go down that road just yet, although the problem certainly won't cure itself!