"Harness Racing Victoria (HRV) will restrict all C0 class races in Victoria from November 1 to four-year-old and older pacers.

The programming adjustment follows analysis of open-age C0 races in the 2017-18 season, which revealed:

From 162 races run, 74 comprised one or more 3YO starters (45.68%)
Of those 74 races, 52 were won by a 3YO (70.27%)
A 3YO started favourite in 62 of those 74 races (83.78%), winning on 42 occasions (67.74%)
Of those 42 wins, 36 were odds-on favourites (85.71%), while 30 were $1.40 or shorter (71.43%)

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https://www.thetrots.com.au/news/art...vicbred-bonus/