The healthy BMI (Body Mass Index) for a 73 year old male who is 6 feet 4 inches tall is 156 lb to 204 lb. Lean men (with visible muscle definition and lower body fat) often fall on the higher end of that range because muscle is denser than fat. For a muscular but lean look, ideal weight is generally 185-210. Currently I am trying to get down to 12 percent body fat, with the remaining 88 percent being lean body mass (muscle, bone, water, organs, etc.). Based on these stats, my ideal weight at 12 percent body fat is 185 lb (84.5 kg). At my current activity level (lifting 3 days a week, averaging 15,000 to 17,000 steps per day), I will need to lose at least 10 pounds of body fat. This means eating no more than 2,000 calories per day and staying on track with training, protein, and sleep. I think this is possibly doable in 8-10 weeks.
I think everything is dialed in. The key now is consistency.