Hey! My fist horse was one year younger then me, he was bred by my family and lived with us since he was born! Unfortunately we had to put him down when he was 17 due to illness!
I still have a half brother of my first horse, he's 21 now and behaves like a 4yo! They were best friends as they lived together for a long time!
I was 7 when I got my first horse. She was an old lesson horse that a local barn wanted to get rid of because she couldn't jump anymore. She was still sound to ride, so my mom bought her for me. Sadly, I don't have her anymore. She passed away a few years after I got her. She would be 35 or so if she were still alive!