I don't feel like you can treat aging as simply a sum of its parts. Sure, there are some major causes of age related deaths like heart disease that we can work

I don't feel like you can treat aging as simply a sum of its parts. Sure, there are some major causes of age related deaths like heart disease that we can work on and potentially expand average lifespan by a few years. However, the core problem of aging is probably best thought of as a disease in and of itself, where the things that actually kill you are symptoms. We need to make progress on the underlying mechanism that makes us more brittle over time.