I doubt it. Most evidence from people of various ages seems to indicate that your all-nighter capacity (a proxy for general age-variant startup capacity) only s

I doubt it. Most evidence from people of various ages seems to indicate that your all-nighter capacity (a proxy for general age-variant startup capacity) only seriously falls off after late-30's early-40's, not early-30s. By the way, the light-gray-on-white font in the comment field bugs me.