How old do dragonborn live?

around 80 Dragonborn Traits They walk hours after hatching, attain the size and Development of a 10-year-old human child by the age of 3, and reach Adulthood by 15. They live to be around 80.

https://roll20.net/compendium/dnd5e/Dragonborn#:~:text=Dragonborn%20Traits,-Your%20Draconic%20heritage&text=They%20walk%20hours%20after%20hatching,live%20to%20be%20around%2080.