How Old Was Damon When He Turned

At what age were Stefan and Damon turned?

Damon and Stefan were 24 and 17 respectively when they were turned into vampires by Katherina Petrova in 1864. There is said to be a 7 year age difference between the brothers.

How old is Damon in human years?

When Damon was turned into a vampire, he was 25 years old, and since The Vampire Diaries seemingly takes place in real time – therefore, beginning in 2009 – that means Damon was 170 years old when the series started; he was 178 years old when the show ended.