Separate users content by year chosen
A "user type" is a role, right?

You can create a Year field as either a Date, Taxonomy, or plain Text field.  Then you can attach it to each of the content types that these users are allowed to post.

I have not used it myself, but I think that the Field permissions module will let you restrict this field to just the desired role.  If that does not work, you could do a little theme work to add the user's role(s) as CSS classes on the &lt;body&gt; tag, then hide the Year widget with CSS.