What's there to debate? You don't suddenly stop being however old you are just 'cause you forgot your age, and you don't suddenly stop having a birthday just 'cause you forget when it happened! Those things still exist, they're just...

[He makes some kind of noise on his end in lieu of a shrug.]

...y'know. Lost or something.

Anyway, October's pretty far away. [Everything not immediately around the corner is far away for someone like Josuke, brimming with excitement.] How're you gonna get your celebratory fix in the meantime?