The effects of general anesthesia, surgical incision lines, and your body healing take time. Look at yourself in the mirror, and take a deep breath. Bad news is you are not an 18 years old any longer, you are 50 plus. You just don't bounce back from surgury, a bad cut, or bruse like you did when you were 18.
That why in the good old days we did not draft 50 year olds into the Army, or the NFL would pass on you in their draft no matter how good you could throw, catch, or kick a football.