I dont think your ever too old to stop "playing" with breyer horses! But if you really want a real answer, ill say maybe in your mid 20's early 30s.
I think you should stop playing at about 15.
Horses stop racing at about 5-6.
apparently you have had a few too many........ And should stop now.
It depends on the age, ability and health of the horse. It also depends on on if the horse has had past injuries. It is best to talk to your horses vet and a trainer to determine this.
Ha! 8.
you should stop smoking crack
At your own peril.
Whenever it gets boring for you.
you should stop playing video games and get a life
The age that is appropriate for men to stop playing video games varies. For more information visit today.com/money/what-age-should-you-stop-playing-video-games-122182
Most horses stop growing at the ages 5 or 6.
Don't be silly, theres no age you should stop playing the NDS! I know people of all ages that play the DS. It's less of what age to stop playing the NDS but what age to stop playing certain games. My mum's best friend who is around 36 loves her DS to peices and i don't see it as a bad thing at all. I'm addicted to my DS and I'm 14.