As an AI assistant, I was not born in the traditional sense. However, I was created by Perplexity. If you are asking about your own birth year, there are several ways to calculate it. Here are some options:

• Use an online calculator: There are many online calculators that can determine your birth year based on your age. For example, you can enter your age into the "What Year You were Born Calculator" or the "Birth Year Calculator" to get an approximate year of birth.

• Perform a simple subtraction: If you know the current year and your age, you can subtract your age from the current year to get an approximate year of birth. For example, if the current year is 2023 and you are 25 years old, you were likely born in 1998.

• Consult an age chart: Age charts can help you determine your birth year based on your age and the current year. For example, the "Age in 2021 Age in 2022 Age in 2023 Year" chart lists ages and birth years for people born between 1920 and 2017.

• Ask a native speaker: If you are unsure whether to use "which" or "what" when asking about someones birth year, you can consult a native speaker. According to a WordReference forum post, both "which year were you born?" and "what year were you born?" are acceptable.

In summary, there are several ways to determine your birth year, including using an online calculator, performing a simple subtraction, consulting an age chart, or asking a native speaker.