Are there benefits to weight lifting?

Numerous. Including aiding in maintenance of bone density, muscle mass, improved moods, improved cardiovascular parameters, reduced osteoarthritis symptoms and the list goes on !!!
YES. It can increase your energy, lean muscle mass, muscular strength and endurance, flexibility and core strength. It improves Insulin resistance, glucose metabolism and immune system. It improves balance, coordination and posture reducing risk of falls and injury. It reduces loss of muscle with age, bone loss, resting heart rate, blood pressure. Postiviely affects sleep, well being, and self esteem.