I used to hover around 30-40, now I am more busy or wasting my time, so I am around 15. Which made me think that, assuming that live another 50 years, at that

I used to hover around 30-40, now I am more busy or wasting my time, so I am around 15. Which made me think that, assuming that live another 50 years, at that rate, that is only 750 books left. Which is kinda sad.