Greetings, iam Peter Wareham, Peace out!
How Much Do Runners Slow Down With Age?
Research indicates that runners who remain highly fit can expect a 0.5 to 1 percent decline in performance per year from age 35 to 60. After age 60, performance decrement tends to increase at a faster rate.
How Running Can Slow Down Ageing - Sport Science: Running
From ninety year old marathon
Does Getting OLDER mean Running Slower? | How Does Age Affect Running Performance?
Getting older is a fact of life - the one thing we can rely on happening. But how
Why Athletes Get Slower With Age
… discusses the reasons why