Want to be fit for the last third of life

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I'm a 61yo female in general good health. Reckon I have 15-20 lbs to lose. I started doing a strength-training routine a couple months ago (2X week). Good improvements in strength, sleep, mood. Coach sez don't restrict calories at this point--his philosophy is to lay down the muscle first, THEN tackle the weight loss. This makes sense, but the tire around my middle really bugs me. (It's like I recognized that I actually HAD a body and as a result I find the extra weight much more disturbing.) Lost a few pounds on FP at 1200 calories/day (recommended for pound a week loss) a while back but don't want to lose any muscle I might be gaining. I'm tempted to up the protein and shoot for 1500, but maybe I shouldn't be in such a rush. Your thoughts welcome!