I don't know Robb, you might surprise yourself. These boys were doing all right in their late 30s.
http://stats.allblacks.com/Profile.asp?ABID=758
http://stats.allblacks.com/Profile.asp?ABID=107
http://en.wikipedia.org/wiki/Waisale_Serevi
It's the guys now who are having the life smashed out of them from the age of 18 who seem unlikely to playing much beyond 30. But yes, you'll ache the next day.
Once again with regards the article, my pleasure completely.