Conversation so far:
who won the tour de france in 1985?
Bernard Hinault won the Tour de France in 1985.
who was the most recent Tour de France winner from France?
1985, France, Bernard Hinault, La Vie Claire
who won the Tour de France in 2019?
Egan Bernal from Team Ineos
who was the youngest Tour de France winner?
The youngest Tour de France winner was Cornet Henri, who was 19 years old.

Question: which year?
Self-contained rewrite: Which year did Henri Cornet win the Tour de France to become the youngest winner ever?