Dd is 14 and has always had at least one nap a day although only for 40 minutes or so.
This past week she will not sleep at all in the day. She doesn't seem too bothered by it either, although she was falling asleep at dinner last night.
My other 2 DC didn't stop napping until much older than this.
Will miss her naps at it is the only time I get to mumsnet lie on the couch do my housework