A similar trend can be seen with sales also. We seem to be offloading players around the sge of 26-27 or so, combined with young players after their initial contracts but before they need to be decided upon extending past the age of 22 or so.
Anomalies to this again can be seen in the Gordon, Richy and Onana sakes, but again these three (well first two for certain) where more forced due to needing to comply with the financial regulations - essentially both where sold earlier than the model we seem to be applying would have wanted.