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Lifting weights (resistance training) becomes more important as we age—not less. Here's an old list I had on hand. Not sure where I got it.;-)

Prevents Muscle Loss (Sarcopenia): Starting around age 30, adults begin to lose muscle mass and strength—an effect that accelerates after 60. Resistance training is the only reliable way to slow or reverse this decline.
Preserves Bone Density: Weight-bearing and resistance exercises stimulate bone formation and slow bone loss, helping prevent osteoporosis and fractures.
Improves Balance and Prevents Falls: Stronger muscles support better posture (and less back strain), coordination, and balance—all critical for fall prevention, which is a major risk in older age.
Boosts Metabolism: Muscle tissue burns more calories at rest than fat. Maintaining muscle helps manage weight and blood sugar more effectively.
Supports Mental Health and Cognitive Function: Studies show resistance training reduces anxiety and depression, and may slow cognitive decline.
Improves Joint Function and Pain: Contrary to outdated myths, weight training improves joint health when done properly. It can reduce arthritis symptoms and increase mobility.
Promotes Independence: Maintaining muscle means maintaining the ability to get out of a chair, climb stairs, carry groceries, and live without assistance.

You may be talking about people below age 75. After 75 no one should strain any muscles by lifting weights, very easy to get sore muscles and they take a long time to heal after age 75.

I am 85, avoid weightlifting and have amazing muscles strength. I can mow grass with push mower, do all house repairs myself, so have adequate muscles. More muscles one has, more hunger pangs will one get. Last thing a super senior needs is excess weight. Where is the need for lot of muscles after age 75? Definitely not going to work for Fedex delivering packages. Every time I am at the gym, I see people exercising upper body with weights. Very bad idea for older folks. What seniors need is aerobic exercise to keep heart muscles strong and keep arteries free of fat deposits.

Love that list. I live in a wonderful upstairs apartment with a beautiful view. 15 steps up. Many friendes won’t climb them but I’m up and down several times a day.

“How can you do all those steps?”

“I can do them because I do them.”