Let's count our black swans when they actually hatch... There are many ways to induce aging artificially and then fix it without affecting regular aging, just like there are many ways to cripple your mental performance and then ameliorate the damage without producing a useful nootropic.

(Besides that, progeria has been justified by its benefits in understanding serious issues which are compelling to a '"rational" person' - like everyone else's aging. Just google 'progeria "normal aging"'!)