I sat next to a guy in ground school that had just started flying about a year and a half ago. He was in his mid forties. There were definitely others in class older than him. I'd say if you are not 60 yet (soon to be 65 perhaps) then it is not too late to start. Don't be in too big of a rush, remember to enjoy all your flying that gets you to your ultimate goal. I definitely look back and miss some of that flying. Best of luck.