Cohort progression — MKS Jagiellonka
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 breaststroke100 freestyle50 backstroke50 butterfly25 backstroke25 freestyle100 backstroke100 breaststroke25 breaststroke200 medley200 freestyle200 backstroke200 breaststroke100 butterfly