It may be true that commands are swift in Ryanair for some.
But let us not forget that there are many experienced older pilots who have been in the industry in many years, some previously operating in carriers who have faced demise, who fly for them and have well in excess of tens of thousand hours per individual and are aged accordingly.
That experience is also around and thus to say that each Ryanair crew is young or inexperienced just does't stand.
There is a balance amongst operating crew in terms of age and knowledge like in many airlines. The one "Ryanair" (but equally read "easyJet") difference is that some crew are allowed an upgrade when they meet the criteria, while in may other airlines those criteria are only tested when seniority allows them to be tested.