Nana Speed

Luke was talking about how fast he could run this morning - here's the conversation that followed...
Ryan: Oh yeah, well I can beat you.
Me (to Ryan): Oh yeah, well I can beat you!
Ryan: I know. But you are older.
Me: Older doesn't mean much. I bet you can beat Nana and she's older.
Ryan: Sure I could beat Nana. I'd really just have to walk!