Take a photo album ( hard copy is best ) and reminisce - if this works well, you can do more variations to it - comparing old pics to new pics of the same person.
An older lady (90's) I know use to love to gamble - now we take her tons of scratch-offs. She has lots of fun with them - just have to remember to have her do her thing on a tray lest there is scratch off dust floating around. She does win some too which she likes.
As with anybody else, they have likes and dislikes and different abilities - get creative based on what you know about them.
My 82 year old Dad moved into a 55+ community, but we can’t get him to participate in any of the activities. My husband and I take him out to dinner and have him over for family gatherings, but he complains that he is bored at home. How do we get him to participate with his neighbors? I have even offered to go with him.
My Mom is 91 and moved in with my husband and I 2 years ago. I resigned from my full time job at that time. Like you, we take her out to dinner and she participates in all family gathers, but she doesn't want to do anything else. I've tried to get her to go,with me, to pool exercises, chair yoga, stretching exercises and Cares, per her doctor's suggestion, no go. I've lost all my friends and my husband and I no longer have a social life. I can't leave her for more than 2 hours alone. Mom only wants me to stay with her, she's not really happy when I go out and leave her with my husband or daughters. Every caregiver I had come to meet her she doesn't like. I have a very sweet neighbor who is a certified care giver and has watched her twice, but Mom doesn't like her, but does not have a reason.