We bank on experience, as in Fritz, Dunleavy Sr., Stockton and Jewett.
Oklahoma has had great success with inexperienced FB assistants who became world beaters hired as HC. in their 30's: Osborne, Wilkinson, Stoops.
No need to further point out how much better our 20 year assistant hardball coach is than all the young Greenies now head hardball coaches.
In almost all cases success comes more easily to the young not burdened with the "I can't" mindset who also relate to teenagers and young adults in their early 20s.