That work is probably why they are still going strong :')
Of course you're right! I was just humbled when they first came by to deliver hay a few years ago. I had talked to the dad, and yeah - he was old, but still strong, tanned and wiry looking. He said "My son will be with me to help stack it too". I was picturing a young man, and not a 'son' who was older than my dad! And yet, they could work harder than I could!