I can't speak for you, but for me at 68 with 47 years of regular lifting, and for those who like me have lifted most of their lives, this is not the case. Like all things, it depends. I lift for two hours at a time, three days a week with one extra hour with a trainer, unless I'm on adventure travel. I have not had to slow down one bit. However, that is because a)I had damned good training early on, b) I rarely overdid it, c) I took my time recovering from inevitable injuries, and d) I planned to do it for life. Am doing it for life. I would respectfully argue, Geoffrey, that this isn't a good assumption. Guys in my gym were no less intense at 50-60. What does change is that we will change a hand or leg position, shift to different exercises, be far more careful about form, and really focus on the sleep and nutrition part. We would, as a group, laugh out loud at the 4-5 day recovery idea. As with all things, when you get to this age, you will likely be gobsmacked at the ageist assumptions people make about being over sixty. Ball State's Scott Trappe did a study comparing 75 yo muscle in lifelong athletes with 25 yos and found basically no difference. Yah, we're wrinkling, but the strength, the power and vitality are all there. The key is what you began the story with: lift for longevity, not the biggest biceps on the block.