[ There's the smallest pause where his mind registers that, has to take a second to pull it apart because how exactly was that meant, then - never mind, it's obviously teasing related to the topic at hand, and Claude rolls his eyes in the biggest eyeroll he can possibly manage. ]

Save that for if Lysithea gets here where she'll now be far younger than either one of us.

[ Another joke's about to follow that, like how the Singularity might have a sense of humor and pull her from the future to mess with them both, but then he remembers, abruptly, everything she's told him. No, he's not going to tempt fate there. ]

Or anyone else, unless this is just you trying make yourself feel better about your elderly state.