BOFOF did that one year. It was a beautiful evening, and he wondered why he was out running instead of sitting in the park with a beer!
"Bottle of beer for any finisher who beats or equals their age in minutes. Race record is 41:40 - so a good target for all Vets!!"
If I did that I'd have taken 3 minutes off the women's record - I wonder if a woman has ever managed it?