Take them for coffee or movie date: Agreed, they do not belong your generation but you can always acquaint them with your world. Take them for coffee or a movie once in a while without special occasion. Watching old classics at home could be a hit idea. Also, do not hold back if they ask to you accompany in a generations old coffee shop. At the same time, do not feel shy of taking them to a swanky restaurant wherein you have spent thousands of rupees multiple times. There is nothing wrong in building million dollar memories.
Go on vacation: This time plan a super-cool vacation with your grand mom and grand dad. Take along parents of both your mom and dad. After all more the merrier and they shall have one another’s company too. Plan activities which interest them and head to the destinations which suits them best. Make sure you take them for a medical check-up and carry all the necessary medicines before taking off to the leisure trip.
Go on a nostalgic trip: Just visit them without informing once a week if in the same city. Patiently hear when they share some important experiences with you. Those may turn out helpful. You may not agree to everything what they say but you can always gladden them by listening to the conversation in rapt attention. Drive down to the memory lane and you can come across many trivia, little unknown facts. Grannies have solution to all the problems in the world; make them feel important by sharing your problems, be it beauty, relationships or job.