Numerology of Birthdate To Age?

I would love to know what it means/or if it's called something when every year your age of that year adds to your birthdate of that year (year on year). Example, this year on 04 Sept 2021 (=9) I turned 45 (=9). It was 8 (44) last year, 7 (43) the year before and so forth. My son has the same with his age and birthdate each year as well.