Ageist against myself

I am prejudiced against myself. I’m in my late 60s and feel like I’ve done it all. I use the excuse of my age to not pursue much of anything. My husband and I are retired and financially comfortable. I truly don’t know what to do with myself. When I hear about how busy everyone else is I think to myself “enjoy it because there may come a day when you find yourself with not enough to do.” You talk about buffering and I spend most my time buffering because I don’t have anything else to do. I’ve tried many times to create a bucket list and there just isn’t anything that I want to do that I haven’t already done. I know I sound depressed and I really am not. I just don’t know how to proceed. I can hear you saying now “if you did know what would the answer be.” But I don’t know. I’ve tried volunteering, classes, and it all just seems so pointless. Any advice?