That depends.
A PC that was high-range at its' time would do fine at six years old, a mid-range would lag a bit, and a super low-end like my previous one would completely melt away at that age.
Now, by the 2.5gb ram, I can presume it's mid to high range. Mine had 256mb fyi.
Full specs would be good, though. And don't you have money for parts on your own?
(I tried to get my parents to buy me a new computer for years too, but in the end, I bit the bullet and bought a computer from my own money, and I'm happy with it.
)