Can't argue with your enthusiasm over current prospects but not sure your parallel of 1970 is that accurate.
Yes, Baylor and Grich were both 21 and future stars. And there was Terry Crowley at (23), and Johnny Oates (24).
But May (26) and Motton (29), along with Roger Freed (24) were bit players at best. Rettenmund was 27 and at the peak of a short career. Otherwise our younger everyday players were already established for a couple of years: Blair (26), Johnson (27), Etchebarren (27), Palmer (24), and Hardin (26). So I'm guessing you were aiming at an overall talent comparison rather than a list of hot prospects, per se. Personally I don't recall a time *ever* when the Orioles were noted for the most (quality or quantity) of top prospects like they are now.
On the other hand, if you substitute 1966, you might have a case:
Etchebarren 23, Powell 24, Johnson 23, Blefary 22, Blair 22, Haney 23, Belanger 22, Epstein 23, McNally 23, Palmer 20, Bunker 21, Watt 25, Phoebus 24. (Tho I have no idea how these would rate in national rankings at the time).