music not syncing to ipod

I bought an album from iTunes and I am getting two copies of the album on my ipod. And I uploaded an album from

a cd, it's on iTunes, but it won't sync to my ipod. Could it be the problem with my ipod? It's about 5 years old. Thanks

in advance to anyone who can help me. gilbertmpadilla@gmail. Twitter: gilbertmpadilla