This may sound like a dumb queston, but I'm really not sure. So, here it goes. The strings on my bow are at least 4 years old. I haven't been able to hunt for the last 2 years. Should I automatically get these changed or is there a chance they're still good? How long should they last? Like I said, I really haven't shot in the last 2 years. Sorry if this is a stupid question, just want to make sure I do the right thing. CH