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!
Technically, alopecia is a catch-all term for any kind of balding. "Male Pattern Baldness" is the common term for the sort of balding that most men experience with the thinning at the crown and receding temples. General thinning is more common in the less well known "female pattern baldness", which is what quite a few older ladies experience. Despite the names, it is possible for both men and women to experience male pattern or female pattern baldness, but as the names suggest, one is more common in men, and the other more common in women.
I can't say I've paid that much attention, but Andy has thinning at the crown and a bit of receding at the temples, so absolutely nothing unusual there. He has naturally very wiry hair, so it probably confuses matters a bit, but it still looks very similar to the patterns I see in a few of the men I work with, and my brother. I don't think there's anything to worry about, or need to call a specialist unless Andy wishes to fight nature. He doesn't seem the sort to worry about that, and if he is, I hope he's not reading this thread!