My home was built in 1911 and has 3 1/4" heart of pine flooring in every room including the kitchen (minus the bathroom of course - that was tiled). After 90 years, the floor is STILL in great shape. Just goes to show you that with proper care - Hardwood will last a very very long time.
I'm sure many a kid ran through that kitchen, spilled stuff, and scratched those floors over the years. They look old now, but they are still in our kitchen and whole house for that matter. I wouldnt have anything else. I grew up in a house with hardwood floors and believe that they are the BEST flooring option hands down.