The youngest woman ever to win the Wimbledon singles championship was Charlotte “Lottie” Dod. When she took the title in 1887 she was 15 years and 9 months old.
The youngest man ever to win the Wimbledon singles championship was Wilfred Baddeley. When he got his title in 1891, he was exactly 19 years and 175 days old.
From The Giant Book of More Strange But True Sports Stories by Howard Liss. Illustrations by Joe Mathieu.
https://en.wikipedia.org/wiki/Lottie_Dod
https://en.wikipedia.org/wiki/Wilfred_Baddeley
Lottie Dod (La-de-da!) is still the record holder for youngest women’s champion.
Boris Becker became the new men’s record holder in 1985 at 17 years, 227 days.