Hellzapoppin wrote:
It's called "slowing down". You can either sacrifice cadence or stride length. Usually it's stride length. If you don't like then take up bike riding.
This is the answer. You are not as fast as you were, so the reason is really just decreased fitness. For any given effort level, you are slower now.
It should make sense that cadence for a given effort level is likely the same as it ever was. Cadence is something that is your normal rhythm for a given effort, and you're not going to change that unconsciously. It's going to feel different if you tried, and it's governed in part by the acceleration of gravity. If the slow down was because your cadence slowed with age instead of stride length was the, all old runners would just be lumbering along. You'd also actually need additional strength to get keep yourself up in the air longer between strides to get that lower cadence. That obviously doesn't happen. Since cadence is basically fixed for a given person at a given effort level, the stride length is the aspect of stride length x cadence = speed that must be decreasing.
It's the same thing as an aging cyclist using lower gears, but likely keeping the same cadence as they get slower.