What do you think is the most powerful method to extend human lifespan? I want to extend human life span significantly (hopefully extra 50 years or more), so I was expecting that stem cell technology would help me to do this. But after considering the following, I'm not sure what to study for my purpose.
There are three major manmade stem cells: ES, iPS, and STAP. Stem cells are generally considered as effective tools for life extension technology, but I don't know whether or not all of the three stem cells contribute to it, since iPS and STAP require adult somatic cells whose DNA already experienced some aging process according to DNA damage theory of aging. So, even if these stem cells are used for adult in attempt of renewing organs, they cannot make him/her younger. Since further development of ES cell cannot be seemed optimistically due to legal restrictions, no manmade stem cell still seems to me the strong candidate to extend human lifespan significantly.