Bridge requires concentration and every game is different. It is the perfect activity to keep your brain active.
Learning to play bridge will also guarantee you an active social life. You will be able to join your local bridge class or club. You will meet new people and make new friends.
If you decide to retire to a new area, where you don't know anyone, being a bridge player is guaranteed to help you make new friends quickly. If you are single you will find yourself in great demand as a bridge partner.
Not only will you have an active social life, you will be able to go on holiday with your new found friends to bridge weekends/weeks/cruises across the country and around the world. The perfect excuse to travel!