Strength training enables you to engage in other activities more often and longer than had you not strength trained. You'll to enjoy life more and play longer and more often. Additonally, You will suffer less injuries. Engaging in activities longer and more often compounds the benefits derived from strength training creating a virtuous cycle.
Carole lived with constant back pain. Her back pain disappeared shortly after she began strength training. Three years later she was still going strong attending dance classes with people half her age. The additional activity of dance classes contributed positively to her health as well.