> And if you went 3 years without exercising, you'll be able to get your muscles back much quicker than had you never had the muscle before.

This very much depends on age. I went on statins about 18 months, which destroyed about 15lbs of muscle over the course of a year (160->145). Along with that muscle loss came about a halving or more of the weights I could lift in any given exercise. I interpreted the "do you have any weakness on this medication" question as inability to function levels of weakness, it wasn't until I showed my training logs to my physician that she asserted that I was having weakness.

It's been a year since I went off them and I'm still lifting barely what I could in high school. I'm exploring some different training plans, but AFAIK, there isn't much research into if different weight/volume breakdowns work better for older guys.