As you get older, you'll need both cardio and strength training because that will protect muscle and keep you active and independent as long as possible. Modern statistics tell us that there is simply nothing that compares to exercise when it comes to improving your odds for a long and healthy life. Much of this is thanks to regular strength training. And all of it is thanks to a good God who lends us our daily breath. Weight training works your muscles, joints, tendons, ligaments, bones, heart, lungs, and immune system. Plus you look and feel better.
Even if you're older, why not pray about getting back into the game? As long as your form is good, there is very little danger of injury. Concentrate on what you're doing, and think with your muscles. It absolutely works! Find the strength training program that is right for you and stick with it.