well, I'm 43 and bought one last week.
I've had playstations, and megadrives in the past, and bought the kids a PS2 last xmas.(they're 6 and 10)
the Wii was bought as a little luxury for me, but something the kids could enjoy too.
Bearing in mind the games range from �25-�40, and a lot aren't much better (graphics wise) the the PS2, the real plus with a Wii is the controller.
the kids love playing tennis, bowling and baseball, and I'm enjoying the NFL and Tiger Woods games.
I had a good look round, and ToysRUs are great for trying out the consoles instore.
If it's for yourself, then an Xbox looks great, but I read a lot of reviews saying they broke down a lot.
Lakeside's Mall last week had no Wii's anywhere.....there's a new package coming apparently (?) but I got a good deal from Smyths
Be warned though, that you'll need two controllers and nunchucks, which cost �15 and �30 each.(although you can buy PlaySports and get a free controller for only �25-30