What usually happens in the Borg is that a Heavy 7 will state something like this in a high level talk eg zone visit and then the elders reinterpret and reinvent this as a "rule" and then it becomes the "local rule"/
eg It was never specifically said that the Big A was coming in 1975 but the mass hype and hysteria shows that dubs reinterpreted it, started cashing out etc and the WTS loved it ! They did NOTHING to stop the hype and of course when CO's and DO's started reinforcing the "new rule" it became Law !
So don't be surprised if a young man gets told off -
What is now definitely a trend in my part of the world is that couples are marrying at 17 or 18 Just attended a wedding last year where the lady of 18 had just finished her final year at High School [Called Matriculation] and got engaged within a month of that - Dec and hitched in May/ All with everyone's blessing of course - so maybe they are trying to cap young marriages. Kids are horny as hell these days so they cant risk the DF'ing [they got baptised at 6, 7 or 8 anyway not so ? ] so they have a 10 year investment in the Borg at risk !