As many others on this forum, I made the completely stupid mistake of purchasing a fake 16+ oyster card.
I used it for approx a year when the ticket inspector on the bus approached me and asked for my D.O.B ect.
She took down my details and I received the letter from tfl that everyone else typically receives.
I responded with remorse and my genuine naivety to how serious this situation was.
This happened back in mid Jan btw. I