Cohort progression — NN
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 25 breaststroke25 freestyle50 breaststroke50 freestyle250 freestyle25 backstroke100 breaststroke
Cohorts to compare: 2001 41997 41996 41991 31983 41982 31981 41980 61979 41977 61976 81975 71974 91973 71972 61971 51970 71969 41968 51967 41966 31965 101964 41962 51961 41960 41957 4