Lifespan by David A. Sinclair

I have been reading this book for quite some time now. This book will list how the genes work in aging and how we could reverse aging. Since the beginning of the time, we all are immortals, all life on Earth are immortals. But due to some reason, a mutation, and evolution of our cells, that's why we ended up growing old. Some scientists said that there's an external factor that happened with it. There are a lot of questions hanging around with this topic that needs to be answered, and we have a long way to go, but it's possible that someday we could achieve a much longer lifespan than today. 

This interests me, and I want to study it. I want to live longer so that I could travel to other galaxies and discover new planets and species. 

What would you do if you will live for hundreds or maybe thousands of years?