When I retired aged 68 like you I was at a bit of a loose end. I joined WRVS that operated on our area and helped out taking people to hospital appointments and clinics. I also took a very elderly lady shopping on the Supermarket every Monday morning until she passed away. I loved my volunteering work. I also taught 7year olds in the primary school to knit and do simple crafting for a little while. When I stopped these things I adopted a rescue West Highland Terrier. And a few years later adopted another one. There are so many things you can do if you look hard enough.
Now here is a dilemma ....... what would you do?