Staying social is a key to keeping the brain active and healthy. Continue learning, observing and responding to the world. Conversation and activity are great for exercising the mind.
Being around others you care about, and who care about you, creates reasons to stay well and fosters a positive state of mind. No matter what our age, we are more likely to keep ourselves well if we have people holding us accountable. We are less likely to develop habits of declining well-being if we are around others we care about.