Here is life expectancy by age for SS planning purposes. Hydrae is expected to be with us about another 20 years. Very glad to hear he's feeling better already!
https://www.ssa.gov/oact/STATS/table4c6.html
SS is designed to break even at life expectancy. If you family has a history of long life, and you want to hedge against living well past expectancy, you might wait longer to take it. The good news is when you do the math unless you die toward either tail of the distribution it doesn't make that much difference, so you don't have to sweat it too much. I plan on following my middle path philosophy and starting about 65. Good luck Hydrae!