There is a statute of limitations on nearly every kind of
lawsuit. That means if you don't file within a certain
time frame, you can't ever file the lawsuit. Sometimes it
begins when you're an adult, if the wrongs you suffered
occurred during childhood. Sometimes it starts at the
moment you discover the harm done to you (called the
"discovery rule").
Talk to a lawyer and he or she can tell you whether or
not this is something you can realistically pursue.