Doctor bill from over 12 years ago

My daughter had tubes put in her ears when she was 13 months old, she is going to be 14 in a few months. I just got a bill in the mail from a lawyer looking for $60. The doctor she saw retired and he turned all his old collections over to this lawyer. I don’t even remember if I paid it or what the insurance covered. How long does everyone keep medical record information like that? This seems crazy to me. The lawyer’s office is looking over the records now to see what was paid, they did say if I don’t pay the $60 then I’ll incur court fees.. etc.