How about the great or maybe GOAT Pancho Gonzales ...
He really never retired and continued to beat top players even when he was in his 40s. He passed away in 1995 and I think was 67. There were alot of players that wished he would have just retired since his competitive nature and personality was very abrasive. The only other player that may come close to surpassing his longevity playing achievements is maybe McEnroe. Some players just cant retire and thats whats soo nice about golf, they can basically keep playing (for big $$$) as long as thier bodies hold up.