Legs are where it's at...
Keep cycling and scrap the weights if they're not doing you any good. Ive seen very few people whose arms are dysfunctional in old age, but hordes of people whose legs are their downfall. At 65, I can tell my legs are more in need of regular exercise than upper body. I think it's due to circulation being less efficient. I read a pre-med book that says that at age 60, all the bodies various systems are at about 60% of their peak capacity in the prime of life. And since they all work in concert, they can't make up for one another's weaknesses as they once could.
I plan to keep cycling until I can't even pedal an ebike. Then it's all over but the weeping.