I think so. Actually I've been overweight all my life, but when I actually got around to focusing on what I needed to do to lose the weight I was in my mid-70s.
Now I am 85, and keeping the weight off nicely.
Why didn't I do it earlier? I dunno.
Guess I was too dumb to do it. Or maybe too lazy. I really dunno.
But I finally did it!! I finally lost over 60 lbs. and I couldn't be happier about it.