Staying connected with people can keep you feeling engaged and active. Old friends and colleagues are a good place to start, but this is also a chance to make new connections doing things you enjoy: a favorite hobby, an adult learning course, a yoga class, a book club . . .you get the idea.
If your interests are more specific (e.g., fly fishing, knitting, trivia), there is likely a welcoming affinity group in your area. Even helping an elderly neighbor or tutoring a local student can feel socially satisfying.
Online social networks, like Facebook, LinkedIn and Pinterest, can also help you expand your network to include all sorts of communities.