To answer the first question, he would have sixty years’ fewer mitzvos. If he does complete teshuvah me’iahavah, his aveiros turn to zechuyos, but I still don’t know if that’s equivalent.
As an aside, a life dedicated to the pursuit of decadence is not one of tranquility.
The answer to your second question is that it’s middah k’negged middah. His focus was olam hazeh, so his reward is here.