He isn't the best player in the league of course (my vote would be Silva), but a really good player none the less. Wanted him in the summer, and as Ciara says above, we sure could've used him this season. I have no idea if we weren't in for him because he was too old, or because we felt we didn't need him, but I hope we never stop considering players because of age only.
Resale value is one thing to consider, but experience and playing at close to ones peak is too. Parker have only gotten better with age, and if there's a similar defensive midfielder around Europe, we should be in for that player, even if he's 30+. Makes perfect sense to have experienced back up, when your first choice is only 25, and the rest in that position are kids in the academy.