When do Kipchoge’s performances become too incredible and suspicious?

NYDCRunner1 wrote:

Clean Sport Advocate wrote:

I agree. It’s the age thing that got me the most. It’s actually an interesting psychology case study. How much can someone defy the laws of aging and performance before people who were once believers start to become suspicious. What level of incredible can someone be before their fans become incredulous.

Shelly Ann Fraser Pryce running faster at 35 than she has ever run before. At an age where it is a held belief that sprinters are supposed to be well past their prime sprinting performance years. Perhaps exceptions are possible.