I don't agree mate. Moyes wasn't afraid of bringing in older players when it was right to do so; when they offered value for money and were brought in to provide a couple of years good service. Moyes will be all over Tarkowski. Eriksen on a one or two year deal would work well for us imo.
Rigidly sticking to a below 25 only policy won't bring success. Gbamin, Klaassen, Sandro and Iwobi were all below 25 when we signed them, and they remain some of our most disastrous signings to date. Balance is required, and it's more about attitude and ability than it is about age.