There are some interesting outliers there.
You can see a clear correlation between multiple Tour winners and winning at an early attempt, but Big Mig sticks out like a sore thumb. Indurain though won his five Tours in a row - a record of its own. Bobet was also a late first winner, and his three were also in a row. Obviously if you want to win it loads of times it's best to get started early or you'll run out of time, unless you can line them up like ducks and not miss each year. Armstrong also in the later start but never missed category.
Coppi "only" won twice but won at his first attempt, though he'd already won two Giros by then and would double up with the third Giro that year. The war may have interfered just a tiny bit there as well...
That it took Lemond three attempts to get a win isn't particularly surprising when you know who his teammate was and the story of the '85 and '86 Tours
Next graph please - scatter plot of age at first win x number of wins 😁
Number of wins x age at last win could also be interesting, I'm thinking that might be quite flat