...As of how strong I am how do you measure that?
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Some folks mount from mounting blocks. If you don't want to do that, then the next question is how much effort are you willing to put into learning to mount, and getting your legs strong enough and flexible enough to do so comfortably for both you and your horse?
I did a little riding in my early 20s, and I had no problem mounting up to about 17 hands. I once tried an 18 hand horse, and it was awkward.
I then went nearly 30 years without riding, and started again at 50. Yes, I can get on my 15.3 mare from the ground - but it is more work. For the riding I do, a tall horse offers no advantages - other than I like my mare, so I keep her.
Unless limited by injury or disease, a person can probably learn to mount an 18 hand horse from the ground, if they will work at it. But if height isn't an advantage, then why bother?
If I was in the market for a horse, health & the horse's personality would be my #1 concern. But in Arizona, I could probably find a 14.2/1000 lbs horse with excellent health and personality, so I would.