Sprinters perform better than distance runners the older they get.
(stats obtained from another thread)
M35 100: 9.96, 4.0% off WR
M35 400: 44.54, 3.2% off WR
M35 1500: 3:32.5, 3.2% off WR
M35 5K: 12:53, 2.1% off WR
M60 100: 11.70, 22.1% off WR
M60 400: 53.88, 24.8% off WR
M60 1500: 4:24.0, 28.2% off WR
M60 5K: 16:12, 28.4% off WR
M75 100: 13.49, 40.8% off WR
M75 400: 62.40, 44.5% off WR
M75 1500: 5:22.4, 56.5% off WR
M75 5K: 19:07, 51.5% off WR
M85 100: 15.92, 66.2% off WR
M85 400: 77.12, 78.6% off WR
M85 1500: 6:51.3, 99.7% off WR
M85 5K: 24:51, 97.0% off WR
This is even more impressive when you consider that there are probably a lot more older distance runners than older sprinters.