OutsideOnline published an article on this topic that I just love. Essentially, it advised us to lift heavy weights as often as possible and to tend to injuries immediately.
Lift heavy? Absolutely! One of my favorite things to do. The science here is simple, we need strong muscles and balanced strength to safeguard our joints and move safely. I had a coach that explained it like this, "If you want to get stronger, lift heavy. If you want to improve endurance, lift heavy. If you want to lose weight, lift heavy. If you want to prevent injury, lift heavy." Sound advice.
Tend to injuries? Common sense, but too many of us let injuries fester because "it doesn't hurt so bad," or, "it should feel better soon." Masters athletes need to be proactive with pain management because we do not heal as quickly. And working out injured is a sure way to sideline yourself as you either compound the problem or modify your form to accommodate pain. Take steps to ensure that you work out pain-free; deal with injuries like an adult.