As Eino jotted down some notes, copied additional ones from the board, and then a few questions came to mind, and he didn't hesitate to raise his hand and ask. "Professor, are Sphinxes as good at answering riddles as they are at asking them?" It only seemed fair to Eino that they should otherwise any old ordinary lion could guard a treasure. "Also, can we call them kitty cat?" People sometimes, even grown ones, would refer to others as "babies" and "dears" so maybe that was the equivalent for that.

As to her age, Eino wasn't particularly good at guessing people's ages, let alone a Sphinx. He had never seen one before so how was he suppose to compare? Everyone was guessing young, but Eino initially thought she was an old lady or an old sphinx lady, but he didn't want to insult her. Plus, do Sphinx even age like humans do? Cats age faster than humans so maybe Sphinxes aged like cats or somewhere in between humans and cats? He was in shock to know she was so young.