For older guys who are healthy, doing about half as many reps as they possibly can during strength workouts is enough to get the best results for muscle and nerve performance—especially if they also do cardio.

For older guys who do both strength and cardio workouts, pushing their muscles to the max on every set doesn’t help them get stronger or faster than stopping just short of exhaustion.

When older men get stronger quickly at the start of weight training, it’s often just because they’re learning how to lift better—not because their muscles are growing or getting stronger for real. So, early gains don’t mean they’ll keep getting stronger over time.

If you're lifting weights at about 85% of your max for 12 weeks, going until your muscles can't do another rep doesn't make you stronger or bigger than stopping just before exhaustion — you'll still get great results without hitting failure.

If you're over 60 and lifting weights, doing it more than twice a week probably won't make you any stronger or give you bigger muscles than doing it just twice a week.

For older adults doing light weight training, pushing muscles to complete exhaustion doesn't give extra benefits like more strength or muscle growth compared to stopping before exhaustion, since both ways work about the same after 12 weeks.