Murray looks like a normal 63 year-old, not a Hollywood 63 year-old.
well, not in my realm... as i said, my daddy is 90, and he looks better than Bill Murray... however, my father has lived a pretty clean life... just retired about 18 months ago... physically fit, healthy... has some knee pain... same with my 88-year old mother... i have siblings in their 60s and, quite honestly, my 63-year old sister could be mistaken for Bill Murray's daughter... we are blessed :) we inherited the youth gene...
Imho, he looks more like a normal 73 year old.