Several times!

age 5 : tonsils removed
age 35 : nose operation: I could hardly breathe through my nose before!

age 40: ear operation: I was getting deaf in my right ear. So one of the 3 middle ear bones was removed and replaced by tificial one. Tough recovery

age 47: major back surgery. They operated from the belly-side! One disc was completely removed, and a new one, made of titanium, was inserted. Very risky operation.....