Women over 60

Almost? I'm 69, lost weight at 59-60 after having been overweight to obese for around 30 years. I lost around 50 pounds, down to a healthy weight, have been at a healthy weight since. I'm also severely hypothyroid (properly medicated for it) in case you think that might matter - I think it doesn't change anything in terms of "how to".

I used this approach for eating:

No one approach works for everyone, so I'm not saying that would work for you, but you'd asked what worked for me. I use the same general way of eating in maintenance - the personalized routine habits I'd worked out during loss.

At the start, I followed the MFP calorie goal for 6 weeks or so, then adjusted that goal based on results. MFP's estimates are close for most people, but I'm the rare person for whom they're surprisingly far off. A few weeks average results, following a fairly consistent routine, should allow a personalized calorie goal that will make things more predictable after that - at least that was my experience.

I'd already had a decent workout routine for a dozen years while obese, so I pretty much kept doing what I'd been doing, except that I put more of a priority on strength training consistently, something I usually had been doing only seasonality as my preferred activity (on water rowing) is demanding in the other months. I was doing something active around 6 days most weeks, and generally still do, though I've slacked off a bit this Winter because of some bumps in the road.

Many people increase walking, but I don't usually do lots of steps-based exercise because of bad knees, just walk enough to stay conditioned to it. Mostly I row (boats when I can, machine when I must), cycle (paved trails in Spring through Fall, stationary bike in Winter), and am generally back to just moderate seasonal strength training though I did very little of it this past Winter. I throw in other random things occasionally that seem fun.

I can't say that it was harder to lose weight at 59-60, because I hadn't really bothered to try in a long time, and never was a "diet all the time" person or yo-yo dieter. I'd mostly just gradually gotten fat, then stayed there. Honestly, I thought weight loss would be harder than I ultimately found it to be. The quality of life improvement was so major, I could kick myself for not doing it decades earlier.

I feel like weight loss is possible at pretty much any age. Perhaps most of us have calorie needs that decline as we age, and often have gradually gotten less active in our daily lives and perhaps with exercise besides, so we've lost muscle mass and fitness. That lost muscle and fitness makes moving even more difficult and less fun, so it can turn into a downward spiral of fitness/strength loss and inactivity, lowering calorie needs and limiting best health. Many of those things are reversible, under our own control . . . but commitment to the process, patience and persistence are necessary. Just my opinion and experience, though.

I'm cheering for you to succeed: The rewards of success are more than worth the effort required, IME.