Cohort progression — KS OSiR Bielawa
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 50 freestyle50 breaststroke50 backstroke100 breaststroke100 freestyle100 medley50 butterfly100 backstroke200 medley25 backstroke25 freestyle25 breaststroke100 butterfly200 backstroke
Cohorts to compare: 2015 42014 42013 122012 72011 52010 92009 32008 52007 102006 62005 142004 82001 4
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2015 born 2014 born 2013