I'm 49, and even though I'm not strictly calorie-counting, I definitely have been increasing my awareness in that area, especially in terms of the amount of foods I eat that have mainly fat and calories and not so many other nutrients.
For example, a few weeks ago, dh bought a Marie Calendar pecan pie. When I saw that 1/8 of the pie was nearly 500 calories, I just decided that I didn't want roughly 1/4 of my day's food to be pecan pie. So I cut my one-serving pieces in half, and for a few days with my morning coffee, enjoyed a little sliver of decadence.
At this phase of my life, I want to make changes that I can live with for the rest of my life. Rather than giving up anything I really enjoy, I find ways to be happier with a much smaller serving than I used to eat, such as by sitting down with it and taking the time to eat it slowly.
As I mentioned further up thread, yoga helps me stay in touch with the fact that I'm already connected to all the good things in life. Being happy isn't about cramming stuff into my mouth -- it's about being still and finding the happiness in just breathing and just really, really, being here, in this moment. It's funny because a teen in my life doesn't understand why I see my weight loss as spiritual -- it's so obvious to her that I'm losing because I'm eating fewer calories and burning more calories by exercising -- and on the surface, that's true. But it's my connection that makes it possible for me to be really happy while eating so much less than I used to.
And if I weren't really happy in this new way of life, it simply wouldn't be sustainable over the long haul. And I'm simply done with the back-and-forth stuff, with losing huge amounts of weight only to gain all that back and more. I'm ready to just get healthy and stay healthy..
I think that's one positive thing about getting older -- you know yourself better so you're more realistic about any self improvement programs you embark on. It may take you longer to lose weight than a younger person, but you may also be more likely to stick with the positive changes you've made.