Surely the thing to point out on this age thing is that both Tiatto and Wilcox are both better than Jordan Stewart.
IMO Wilcox isn't that good, but if the players are better or can even compete and put pressure on our existing players then its not a problem. Bearing in mind we only had two left sided players (Stewart & Morris) we needed another 2, and as left sided players are notoriously hard to find, i think Tiatto & Wilcox are about the best we could have got.
Once we start signing players who are worse than the likes of Stewart (who is shite, and young) i'll begin to be worried.