Horse Age - The Horse Forum
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post #1 of 13 Old 07-20-2009, 07:21 PM Thread Starter
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Horse Age

I would like to know, at what age is a horse generally considered fully grown? And does this vary at all from breed to breed?
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post #2 of 13 Old 07-20-2009, 07:32 PM
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The average horse is consered fully mature at the age of 6.
It can vary somewhat from breed to breed.
The QH is generally fully grown at 5 years old, and an Arabian may not be fully grown until they are 7.

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post #3 of 13 Old 07-21-2009, 04:49 PM
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Most horses are still growing until they are 10. But that age can vary depending on what breed it is and who you heard it from. It's the same as the big thing about when horses can be called mares or stallions or geldings. Some say 3, some say 4. My horse is still growing and she's about 10.

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post #4 of 13 Old 07-21-2009, 04:52 PM
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Most horses will generally reach their peak height between 5 and 7, however, many will continue to build muscle mass later into life.

Always remember that feeling of looking at a big, open country over the ears of a good horse, seeing a new trail unwind ahead of you, and that ever-spectacular view from the top of the ridge!!! Follow my training blog: http://robertsontraining.blogspot.com/
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post #5 of 13 Old 07-21-2009, 06:28 PM
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It also depends on bloodlines/genes within breeds. Our mare Lady (now 7) was almost her current size (14.2hh, 1100 lbs) at 3 1/2, while our mare Cinnamon (now 5, 14.3hh, 950+ lbs) and all her siblings kept growing until 7+.

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post #6 of 13 Old 07-22-2009, 12:35 PM
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Wow, I didn't realize some of them grew as long as they do.
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post #7 of 13 Old 07-22-2009, 12:44 PM
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Dr. Deb Bennett wrote a piece on this.

http://www.equinestudies.org/ranger_..._2008_pdf1.pdf

"All horses of all breeds mature skeletally at the same rate."

No horses are mature before the age of 6. Add 6 months on for a male and if the horse is taller and has a longer neck it will be even longer for the lateral fusion to be complete. It may take a taller male horse of any breed up to 8 years to have fully mature bones.

Now - the article aside - I do know my short haflinger continued to fill out with his muscles until age 7. Mentally - I'm still seeing improvements in his mental maturity at age 8 and I suspect that will continue to improve over the next year or two.

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post #8 of 13 Old 07-22-2009, 12:49 PM
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AZ the QH is 5ish and acts like a toddler

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post #9 of 13 Old 07-22-2009, 01:04 PM
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I asked the vet the same question. He told me that (because I have QH's) they stopped physically growing at 4. I know my friend has a TB and it doesn't stop growing until around 6 or 7.
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post #10 of 13 Old 07-22-2009, 02:40 PM
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Yeah, some horses are just funny. My mustang Koda took a growth spurt and shot up about 2 inches in height after I started riding him as a 5 year old. What a goober.

Always remember that feeling of looking at a big, open country over the ears of a good horse, seeing a new trail unwind ahead of you, and that ever-spectacular view from the top of the ridge!!! Follow my training blog: http://robertsontraining.blogspot.com/
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