Plenty going on right now about veterans that have been available or will be available, and let's make this clear. They went young for a few reasons, and those reasons won't change.
Now, if they come in under need and don't elect to replace, for instance, an ailing DT with another guy who almost made the roster the first time, that's when you might see a vet. After the start of the season, a veteran's salary is no longer guaranteed.
So, keep that in mind in week 2 when they go get a veteran backup center.