Yes. If you're talking about getting muscle back that was lost due to (forced) sedentary lifestyle, I'd think bodyweight stuff can be quite effective. *Any* consistent weight bearing muscle stress should do more than just halt the loss.

I think @plant_based misses the point. This isn't about getting "swole" at age 54. It's about reversing body composition effects due to sedentary lifestyle. Testosterone may indeed increase with measured weight training, as long as it's not offset by a ton of endurance stuff. Sedentary behavior is known to not be great for male hormones.

At some point a plateau may be reached without heavier weights. But I don't think you'd need to rush to start in with weights until that plateau is reached.