There'd be many a life of debauchery led until the age of around 65 then much repenting
Which is kind of what happens now, except everytime there's a big "bad" event in the world (earthquake, terrorist attack, flu epidemic) numberless JWs begin to think about cleaning up their act, just in case....
In that regard, it's a phenomenon seen in may religions: look for the signs so you can work out when to truly repent...