I suggest you find something to keep you busy each day of your retirement. If you are up to it, you may even find time to step out of the house every day. That is how I handle it, and I am doing quite fine. To be perfectly honest, what I do is that I camp out in the woods not too far from the county in which I stay, and I either hunt of fish for trout. What's to say you cannot be any more creative?
Please, long before you retire, you will do well to put some investments in place to cater to your old age and retirement. It is only wise, because you don't want to depend on social services then, I tell you. It is bad for your sense of worth anyway, to have to depend on others because you could not cater well enough for yourself. What does that say about you?
If you have a grandma that has just retired, you need to help her understand that she keeps on slowing down because she is doing nothing. Tell her the pains will not go away until she begins to do something about it despite retirement… then help her to her feet and take her for a walk. She won't be so grumpy then. This usually happens without adequate planning.
You don't have to go everywhere with a car once you are retired. Give the auto a break and take a walk. Make it a jug; or a short run. Sure, you are no longer 20, and you will feel winded when you are through, but you'll be glad you did it. This is part of what planning for your retirement is about – planning to know what to do and what not to do and how to do what you plan to do!
There are way too many things to do in your home in the first place. There is no reason why you should waste away simple because you retired. Beyond your home, you could even go to the city, the state, the world! Whatever you do, just don't stop, because when you do, old age will really catch up to you. I'm telling you, you don't want that.