I think retirees need to have a purpose such as travel, volunteering, hobbies, taking up sports, hiking, golf, card groups, taking classes to learn a new craft or just take classes in anything. There is so much out there to keep you busy. If you're bored it's your own fault. Retirement should be a fun, carefree time in your life.
You need to get away from the house and meet and talk to people and develop new friendships.
If you stay at home and all you do are 'chores' you will go stagnant and health issues will arise. Active people in both body and mind are healthy people.