Then I do the exact same movements using 10 pound weights. Then I go back to the 5 pound weights for the third set. Of course, weight lifting will only mitigate some of the ravages of time. No matter what you do, the only people who look 20 are the kids who are. However, you can feel better about your health when you get on the scale and still see the needle inching up.
Muscle weighs more than fat, so scale weight becomes an inaccurate measure of success.
Look in the mirror instead. Try to slip on those pants shoved to the back of the closet. The button will tell if you've made progress. P.S. Weight lifting also improves mood and is the best way to fight osteoporosis. Freud once said ignorance is no excuse for dumb behavior.