If you are bored when retired it truly is your stuff. I honestly don't know how I managed to fit work in when I was, cough, ''economically active.'' Being time rich is like being a millionaire, you've suddenly got so much resource at your disposal, in this sense a resource that was denied to you when you're earning a living. Just make sure there's enough honey in the cupboard to maintain a reasonable standard of living.
Most retirees won't have a mortgage, they may well have a pension and had a lumper. It's amazing how well you can live when you're debt free, mortgage free, not paying for a season ticket etc.
Best wishes to anyone deciding to walk off the treadmill.