I accepted RN's injuries and Pete's handicap too, if Pete had Great age shift (this is said by Kuerten and Lendl) then he would enjoy 6-8 years of extra career into his 30s, so that puts his career at RN level, he would be done and dusted at minimum 36-37 instead of 31.
This is what great age shift is all about. If we don't accept great age shift then we are arguing in bad faith.
11 of the 17 oldest ATP top 10s are born in the 1980s, so this proves it, Roger's longevity was not out of the blue, even Pete would have played till late 30s at the highest level if he was of this era.