Will the newest version of itunes that I need for a newer ipod still work for an old ipod?

I have an Ipod that is 4 years old and have an old version of Itunes that I use with it. My son wants to start using his Ipod that he just got last Christmas on this computer and Itunes wants me to download a new version of Itunes for it. I'm wondering if I download the newer version of Itunes, will it still work with my older Ipod. They are both Ipod Shuffles. Thanks.