I combine a reasonable amount of walking, or when the weather is like today - pouring and blowing a gale, indoor exercise, with reading books I enjoy, but also force myself to listen to the news, or read them online.
I find that part of keeping one's brain active is still hearing and discussing opinions that are not necessarily your own.
I also volunteer at the local museum so as to get to know new people and have someone other than DH to talk to.
Let's face it: at this time of life we know what our husband or wife is going to say and think about most things, so it is rarely there we encounter a new opinion.
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wishing you a happy and healthy new year.