Stay healthy. A daily walk, a moderate diet, and very little alcohol.
Be as generous as you can. Volunteer, tip generously, practice kindness in daily interactions.
Keep working. Volunteering, part-time work, full-time work, writing, art, film making... whatever your work is... keep it up.
Whatever interests you, including things like yoga.
Don't buy into other people's myths about age Old-age myths are pervasive and crippling. If you buy into them, they become real. If you don't they won't. Like Satchell Paige said, "If you didn't know how old you was, how old would you be?"