Cohort progression — Lapuan Virkiä
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 100 freestyle50 freestyle50 backstroke50 breaststroke50 butterfly200 freestyle100 backstroke100 breaststroke100 medley400 freestyle200 medley100 butterfly200 backstroke200 breaststroke800 freestyle1500 freestyle400 medley
100 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2013 born 2012 born 2011 born 2009