This is an interesting thread and hits home for me too...
I've struggled w/ my weight my entire life... went through the 60-90 minutes of cardio a day era 6-7x/week and never saw the scale budge or my body shape change that drastically.
About 12 years ago, I discovered weight training and for me that has been the absolute key for keeping my weight in check. Yes, I still do cardio and probably more than the average joe ( about 40 minutes 5/6xweek) but what I have done is add serious heavy lifting type training to my regimen in addition to the cardio and that has worked wonders. Since we do lose muscle mass as we age, anything you can do to maintain or grow your muscles will help be your secret weapon against weight gain.
I just turned 42 last month and honestly, I'm in better shape than I ever have been. I eat more now than I did when I was cardio queen back in the 90's and in my 30's.
That being said, I agree with the poster who said 80% of the equation is diet. I eat more protein, whole grains and fruits/veggies than before too. Of course, I am not perfect, and I've not really met a food in my lifetime that I don't like. But as a rule, I try to eat as clean as possible.
I guess I am of the opinion that it can be done, but you have to find what works for you and what worked at 20 won't work for you at 40 or at 50.
PS.. Congrats Robin on your weight loss!
PPS.. best ice cream ? Oreo Coffee
Lynn M.