Chapter 5 - Number Theory and the Real Number System - 5.2 The Integers; Order of Operations - Exercise Set 5.2 - Page 270: 123

$16$ years

A person who has a blood relative 95 or older will stretch his/her lifespan by 10 years. The number that represents this is $10$. A person who has less than 12 years of education shrinks his/her lifespan by 6 years. The number that represents this is $-6$. Thus, the difference between the lifespan of the two is: $=10 - (-6) = 10+6=16$