monkers
Squire
There aren't any US high school girls beating the Women's World Record in the 100m so it's definitely not age. Lots of high school boys do, which proves it's sex.
Again fruitloops, decline succeeds peak. Decline can not precede peak, that's an absurd notion.
The VTTA demonstrates through its standardised times that athletes decline with age with men declining more rapidly than women.
In a 10 mile TT event, between the ages of 40 to 50 male performance declines by 36 seconds; female performance by only 10 seconds.
Between the ages of 50 to 60 male performance declines by a further 68 seconds; female performance by 45 seconds.
A female rider age 40 completes the ride faster than a 66 year old male.
https://www.vtta.org.uk/standards