Cohort progression — SK Speed
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 butterfly100 freestyle50 backstroke50 breaststroke100 breaststroke200 freestyle100 backstroke100 butterfly200 medley400 freestyle400 medley200 backstroke200 breaststroke200 butterfly