If I was born in 1990 and died in 1989 how old at death?

Someone who was born in 1990 and died in 1989 was -1 at death.

Someone would be -1 if they had already had their birthday or -2 if they hadn't reached their birthday.

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Calculate the age in years for someone who was born in 1990 and died in 1989

If born in 1990, what is the year of death?