Some people, like Aubrey de Grey, are researching how aging works. The goal is to slow down the process of aging in order to allow humans to live longer.
See e.g. https://leapsmag.com/anti-aging-pioneer-aubrey-de-grey-peopl...
See e.g. https://leapsmag.com/anti-aging-pioneer-aubrey-de-grey-peopl...
I think he'd say living longer for remaining disease-free would just be a happy side-effect.
That said, there many companies working on aging biology now: http://agingbiotech.info/companies/