I was 5 but IMO for most of my career I rode at a very poorly managed barn and the training I received wasn’t the best so I basically had to start all over when I came to my new barn.
I got my first horse when I was six, my mum and I broke her in ourselves, thankfully she wasn’t a hassle to break in. I’ve always loved animals, especially horses and since my mum has owned a horse before she was willing to let me have one to call my own.
I was about 5. My great grandparents run a cattle ranch mostly on horseback. I was always that horse crazy kid, so they just gave me what I wanted.