If I was born in 1999 and died in 2099 how old at death?

Someone who was born in 1999 and died in 2099 was 100 at death.

Someone would be 100 if they had already had their birthday or 99 if they hadn't reached their birthday

What Year Were You Born?

How Old Am I In

What year do I turn if I was born in 1999?

Calculate the age in years of someone who was born in 1999 and died in 2099