It is 24 now, and that current number will be reduced to 16, if AA and me fire their Australian 19yo's.
But a very good comment of you about "ghost-teams".
Because in most previous seasons that I was NT manager, there were 1, 2, or 3 starting teams, and therefore much more 19yo's.
This influenced my (mis)perception that there are a very low number of 19yo's this season.
For you to compare, the Australian sizes of the age-groups :
19yo = 24 ( incl. 8 that most likely will be fired )
20yo = 32 ( incl. 1 Aus. ghost team )
21yo = 35 ( incl. 2 deleted Aus. ghost teams, all are free cyclists )
22yo = 52 ( incl. 3 deleted Aus. ghost teams, all are free cyclists ) --> this generation was my last time as NT manager, what explains my misperception.
23yo = 37 ( incl. 1 deleted Aus. ghost team, all are free cyclists )