Running shoes - shelf life?

[Brotherton Lad]

And the shop will lose its cushion of profit.

[noel]

It also depends if they've changed the colour on the new model. New colours make you run slightly faster. This has never been disproved.

[Nowton Park Harrier]

Red shoes are definitely the fastest and descend quicker than any other colour. The age of the shoe has no relevance.