I have had many group one winners with 3yo's in 3yo races but whenever I step them up to all age races these horses look like selling platers, why???
Surely not every 3yo is average, they are not duds so why does the game favour older horses.

i have had many 3yo's win like the oaks and irish oaks, coronation stakes etc and then get beaten in the 3yo up races also. But i have also had 3yo's win the arc by 4 or 5 lengths as well - it just depends on how good the horse is in the game. Still no good in the race builder tho!!