#### Answer

$1$ year

#### Work Step by Step

A person who frequently feels stretched will shrink his/her lifespan by 5 years.
The number that represents this is $-5$.
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:
$=-5 - (-6) = -5+6=1$ year