I'll give you Boak a full year younger but the other two are 6 months difference only and have also played more games which equates to over a season so they would be more worn given the extra work.
You didnt answer my question on what Murphy is providing us vs the cost of keeping a younger player out of the team and sacrificing development? We are still two seasons off playing decent winning finals IMO why keep old tired legs?
Who is he keeping out? The blokes that Bolton was playing? How was that working out for us?
Perhaps what Murphy, and other elder players, offer the team more than what your average supporter realises.