Could it be that the mitzvah applies to you?
Are you a first born son? Do you know if your birth was natural versus cesarean? Do you know that neither your father nor your mother’s father was a Kohen or a Levi? Do you know if you were from your mother’s first pregnancy? Are you unsure whether you father arranged a pidyon haben?
And if you aren’t sure, what can you do?
If you are in doubt, you should redeem yourself, either with your local Kohane or through this website.
This website works mainly because the purchase of the pidyon coins through this site, and the subsequent return of the coins to the Kohane is a valid kinyan/acquisition, just as a purchase through eBay or Amazon is a valid kinyan/acquisition.