@debbraw @zita199 My doctor is very similar with his precautions. I would much prefer to have a very cautious doctor than one who was less so. He also does not recommend rehab centers, many of them do not have the cleanliness standards of hospitals and he feels the risk of infection is greater there.
I was 70 when I had my second TKR and despite some real pain for about six weeks, sailed through and do great now. I am so glad I went ahead and did it. My brother-in-law and a friend of ours had hip replacements last year and both were 75 at the time and did great too. If your mom is in reasonably decent shape I think she should do well also, but there are no guarantees. All surgeries come with some risk.
JK