Attention senior owners!

Anyone here who has had a horse live a long HEALTHY life (30's-40's even!) What do you think contributed/contributes to your horse being sound and healthy fo so many years?

What do you guys think contributes to earlier decline in QOL or ridability?

Would love to hear from everyone!

Context: I lost my horse in what I would say was his peak fitness/health at 19 when he suddenly declined in a few months from Gutteral Pouch Mycosis.

I started a new journey with my boy last year. He just turned 8! I see a lot of horses that vary in health, fitness, age. I would love to hear your guys' thoughts so I can utilize whatever I can to keep this guy healthy and happy for as long as possible!