Ok, ill put a serious reply now.
They will last a good amount of time, many years if you look after them right, like any other bike.
The obvious stuff that will need replacing after so long is the chain, and cassette if you dont catch chain wear in time.
Tyres will also wear, obviously so they will need replacing, but they will last a good amount of time aswell.
My Giant sCR4(base level giant road bike) i would go through a chain every month, and sometimes a cassette, and i had to have a new set of tyres. Oh, and bar tape.
That bike doesnt get used my now because i ride fixed, but its still fine. Just needs some new bartape to make it look abit better.