Give her a moment, she kind of has to squeal as she's caught and squirm about in a terrible attempt to get out from his grasp. Unsuccessfully of course, she knows better than to think he's going to harm her by now.

"Come on, now! I am hardly ancient! Our sister is older than We are, so We still have a good long time to go!" He'll get a pout in return, wriggling to get a glance up at him.

How long had it been, now...

"We think about a week or so, it was not that long back. Luckily for you We have only made one announcement of it so far."