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Does running speed decrease with age? An expert guide

While the world's best marathon runners often peak in their late 20s and early 30s, studies consistently show that running performance begins to gradually decline around age 35. This does not mean the end of your running journey, but it does mean that acknowledging and adapting to these physiological changes is key to continued success. So, does running speed decrease with age? Yes, but how much and how fast is largely within your control.