Ah, talk to the admission officer in CU ask whether they can accept your old score. Otherwise, I think you have to take the TOEFL again.
I applied to OU last November and I took my TOEFL in December 1999. When they decided to give me the offer, my TOEFL is more than two years old too. But they did not say a word about it. The offer is for Winter, Spring and Fall session. I will start my study this fall.
I think you should try to persuade them to accept your TOEFL.