As of my knowledge cutoff in September 2021, the current year is 2023. Subtracting their birth year (1998) from the current year gives us:
2023 - 1998 = 25
Therefore, the person born on February 19, 1998, would be 25 years old as of September 2021.
However, please note that this calculation does not account for any time elapsed since September 2021. To obtain the most up-to-date and accurate information, I recommend verifying their age using a date calculator or consulting an up-to-date record.