Could you be interested in chess? If both your minds are still active, you could play against one another & or buy a computerised chess set (40 quid) to play against individually.
Sqad may be amused by this: The father of a friend reached into his 90s. Once a week his doctor came round for a game or two of chess, both of them being very keen players, his doctor said, "I've got to keep you going as long as I can John, because I enjoy our games so much & I don't have anyone else to play with."
Though finally & inevitably it was 'mate' :0(