I think futuristic ages because what we think looks futuristic is so heavily influenced by what's "cool" at the time.. Otherwise Startrek would've always looked the same.. In reality though TOS is the 60s incarnate and TNG is so 90s it hurts.. Minimalism and sleekness are the only ways I can think of to avoid aging too much.... Futuristic of the 80s is all boxy and Back To The Future/The Last Starfighter-tastic.. Futuristic in the 90s was beige. Futuristic right now seems to be Giger meets cyberpunk with glowing bits.
Fair point, hehe, some of the more out-there imac designs date v badly, lol. Saying that, they were going for retro 60sness when they were made, so.. that's just bizarre. The flower covered one in particular. Neat. XD
I'm just pondering/talking bollocks mostly, I'm certainly no expert on style.

Everyone should buy what
they like best.. There isn't a universal best.. At least the Alienware (and that crazy Asus case) are eyecatching.. Conversation pieces. ^^ I like that a lot.
Having things age isn't necessarily bad either, I have lots of old gaming hardware (atari jaguar, CD32 etc) which are rubbish, look terrible design-wise now, but i love them all the more for it, lol.
edit: wow they picked up the futuristic point before i did!