"Yes you will." River fully agrees with him on that. If she didn't have such a close, personal, child-of-the-TARDIS relationship with the old girl, she might have been jealous.

"You don't think it's possible I could be hundreds of years old?" River eyebrow rises, flashing him a sly grin that lets him know she's just teasing him. "I'm flattered, really. Not that I can say, spoilers and all that."