And you may still weigh 175 at 55. The tape measure doesn't lie. Get that tape measure out and put it on your hips and your waist. Keep checking it. And keep exercising and cutting those calories down until that tape measure gets close to where you were in your prime.
Progress is made where progress is measured.
But they don't set a parameter for how they're gonna measure it. Or if they do measure it, they wait until the first day of the next year. You'd never run a business that way. Document your progress. But the intensity is what's lacking in most seniors' workouts.