My dad was 9 years-old in 1918. He remembers his entire family, 8 kids & his parents, all getting sick, but they all survived. He doesn't remeber any of the neighbors dying ether. Guess they were just lucky.
Personally, I hope it's a bit genetic. All the siblings lived to be at least 80.
I've hoped for the same thing as both my parents survived as one year olds in 1918.