Hi . Unfortunately, it is difficult to know how long someone has had Hep C, but some of the diagnostic tests, such as viral load and liver testing, can give doctors a bit information in that regard. Here is an article about diagnosing Hep C that might interest you: https://hepatitisc.net/diagnosis. I wish I had better answers. Do you have any idea whether you were ever at risk? People tend to think of Hep C as a disease contracted by people who use intravenous drugs, but there are several other risk factors. I hate to overwhelm you with more articles, but you might find this one helpful as you try to determine when you might have contracted it: https://hepatitisc.net/what-is/who-is-at-risk. You might have to accept that you will never know when or how you contracted Hep C and you wouldn't be alone. Many people have had it for so long that it is impossible to know. Know that we are here for you as you go through testing and treatment. Gentle hugs. - Lori (Team Member)