Hitting 60 and just can't lose like I used to

Different people are sated by different things: Experiment.

For some, it's protein, for some fats, for some volume (like lots of low calorie, high fiber, nutrient dense veggies). Even timing of foods or nutrients can matter for some people. In a few cases, people have individual foods that they find especially filling.

Use your food log, think about days or time periods when the hunger hits. What's the context? It can be the eating pattern, but it can also be stress, boredom, poor sleep quality/quantity, habit, etc. (If the root problem isn't fueling or nutrition, the best solution probably isn't food.)

Some types of exercise may trigger appetite, either the day of or sometimes the next day. Sometimes snacks or nutrient timing can moderate that.

Just for illustration, not because I think it'd work for you: I found I needed to get a solid breakfast with plenty of protein, then protein through the day. A small snack, usually protein-y, was useful if I started to get hungry well in advance of a planned meal. (I even kept small, tasty, but not too tempting shelf-stable snacks in my car so I could nip hunger in the bud before it got out of hand.) At some meal(s) sometime in the day, I need volume, usually a big (big!) portion of veggies. While I was losing - not so much now in maintenance - strength training spiked my appetite. A small sweet snack before, a small protein snack after - those seemed to help. (I don't care whether it's placebo effect, if it subjectively works. )

Also, trying to cut calories too deeply for current body weight or energy demands can be a problem. Losing more gradually but manageably can sometimes get us to goal weight faster than a more extreme deficit that triggers periodic over-eating, multi-day breaks in healthy routine, or even giving up altogether. Ditto for restricting manageable-calorie treats that a person could moderate instead, if restricting results in over-consumption eventually.

It may not be true for you, but one thing people sometimes don't recognize when comparing weight loss to younger years is how much daily life activity patterns change over those years. When I was 20, I had a physical job, rode my bike and walked more because I didn't have a car, did active things to socialize. That gradually changed over the years. There can be factors in young adulthood, too: Chasing toddlers, remodeling or landscaping to make a nice home, DIY for projects or heavier home/yard work because of budget constraints, and more. Later life is often a "settle in and enjoy what we've earned" phase, with less of that stuff, more food-heavy or sedentary social activities.

That stuff can add up to hundreds of calories a day, no joke. But it can be somewhat reversible, with deliberate attention. There's a thread here where many MFP-ers share their ideas for adding movement to their day without requiring lots more time:

http://community.myfitnesspal.com/en/discussion/10610953/neat-improvement-strategies-to-improve-weight-loss/p1

Not all those ideas work for everyone, but it's likely to find some in there that can work.

You can figure out a routine that works for you, looking at the all-round of eating, exercise, non-exercise activity, sleep, stress management and all. It's kind of like a fun science fair project for grown-ups, if you look at it that way . . . with a big payoff in quality of life at the end, potentially.

I used MFP to lose 50+ pounds at age 59-60, have been maintaining weight in a healthy range for 7+ years since, now 67 (after about 3 previous decades of overweight/obesity). It can work. Finding new, personalized, sustainable long term habits is key, IMO: Relatively happy routines we can continue almost on autopilot, permanently, to stay at a healthy weight.

Best wishes for long-term success!