I get "bored" pretty quickly if I have nothing to do but sit around in front of the TV all day. When I was working, I always had gobs of things to do, but the first few weeks of "retirement" quickly showed that sitting around with little to do but mow the yard, and run around to the stores, etc., was Not going to cut it. Soooo...we started looking for a place in the country, where we could stay active and fit. We found such a place, and there is a never ending series of good healthy outdoor work to be done every day the weather permits. There is NO substitute, IMO, for staying active as a person grows older.
Find a Hobby, do volunteer work, exercise regularly, eat smaller portions of healthy food, etc. Keep your mind occupied with reading, or joining in something like the games on this forum. Remember....if you Don't use it, you Lose it.