It’s faith in something and enthusiasm for something that makes life worth living. (Oliver Wendell Holmes, 19th century physician and poet)
He also wrote, “Men do not quit playing because they grow old; they grow old because they quit playing.” Continuing to be active certainly will slow the aging process. Being active with enthusiasm, no doubt, is even more helpful. And, don’t overlook Holmes’ reference to “faith in something.” Not just a blind hope, but a firm trust in something (someone) beyond yourself.
Trust in the Lord with all your heart; do not depend on your own understanding. Seek his will in all you do, and he will show you which path to take. (Proverbs 3:5-6)