I'm turning 71 in a month and I have slowed way down. Even 10 years ago I loved fast descents and I still love the feeling but I don't want to court falls. I broke my hip and my shoulder in crashes a few years ago and, despite the fact that they were dumb slow.moderate speed errors, they have led to caution. In particular I have noticed slight feelings of imbalance on turns and riding close to railings on bridges. In those situations and on descents I drop the speed back until I feel comfortable and fully in control.