Thinking about the article to which you linked: Yes, certainly we lose muscle mass as we age, and more rapidly than when we were younger. I used to get calf cramps on long rides and fixed them easily by doing sets of one-legged calf raises to exhaustion once a week. Similarly, you could try doing barbell squats to exhaustion using enough weight to allow 30 or so reps. I usually use between 95 and 135 for that. Similarly, straight legged barbell deadlifts to exhaustion at 30 reps or so, quite light reps, maybe 30-60 lbs., keeping the bar close to your shins and done very smoothly.

And congratulations and kudos for your considerable talent.