On a coarse-grained level the 9 main different mechanisms that make up "aging" have been known for at least a decade now[0]. Each of those areas has different

On a coarse-grained level the 9 main different mechanisms that make up "aging" have been known for at least a decade now[0]. Each of those areas has different and often vast variations of sub-mechanisms that need to be tackled and worked around, to ultimately "reverse"/stop aging. Some are being more concretely researched than others (. The impact of tackling some of those areas are also smaller than some of the others, and to my knowledge there is no clear picture yet which of those are "low hanging fruits" (or if there are any), where solving e.g. 3 of them will increase average lifespan by 20 years. It could also be the case that it's mostly a long tail were each if them makes up for minor lifespan increases. [0]: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3836174/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3836174/