Okay. Wait. Inigo is only getting confused here, so maybe he should backtrack and start with the basics. Because something tells him that asking Senku if he carried out some experiment to make himself younger isn't really going to get him anywhere anytime soon either..

So instead Inigo points to himself.

"Do you know who I am?"

He kind of feels dumb asking it, but what else is he supposed to do in this situation?