Is the lunar birthday the date of birth or is it different every year?

Your lunar birthday is the date of the lunar calendar on the day you were born. Your birthday in the Gregorian calendar is also the date of your birth in the Gregorian calendar.

For example, you were born on the ninth day of February, and no matter which year you celebrate your birthday in the lunar calendar, it is on the ninth day of February;

If you celebrate your birthday in Gregorian calendar, it is also the Gregorian calendar date of your birth date 14. No matter which year you celebrate your birthday in the Gregorian calendar, it is on March 14.