Sorry for your Loss Ben!
Your dad can now have fun with my folks. 73 is young for today, like the new 55 in my opinion, health issues or not.
My mom was only 77. My mother in law celebrated her 80th this month. She looks only 73 to me.
At age 20, I cut my self at work, and still have the keloid scar on my finger. Last week in the garden I cut that same scar. Just over thinking, I added 20 to my current age of almost 57, for a sum of 77. I'm over the hill now, and going in reverse, but I sure hope I make it past my moms age of 77. She was already diabetic at my age, for 5 years.