While we see improvements in hardware and software today, it's NOTHING like the late 80's and 90's. Our first home pc was out of date in less than a year (thank you for that recommendation, Tiger Direct). As a child, I couldn't run games that came out more than about 10-12 months after we upgraded our machine. It really was stunning to be a part of.
And now my home pc is about 4 years old, and replaced a machine that was 9. I plan to run this one for at least another 6 or 7 years unless something amazing happens that nobody sees coming.