Hi Floyd, I hear ya! Don't give up the fight. When we get older it gets harder, not only because our metabolism slows down but also because we get locked into unhealthy patterns of behavior (like sitting in a desk at work all day, eating pizza in the car on the way home, and on and on)... problems we never had as a kid running around all day.
I've used a low carb diet for the last few years and it has worked well, and apart from a few slips ups from time to time it's not hard to stick to it once you get in the habit. I also include a cheat day once a week to keep insulin sensitivity high.
If you're a guy, part of the problem too is your hormones change. Lift weights to keep your growth hormones pumping!