G-d does not say love your parents, He does not say respect them, like them, or even be a "good" to them but honor them? What does G-d mean by honor?
A honor according to my understanding is a standardized weight used in a balance scale (the honor weight.)It comes in various amounts.
Its that B word Balance.
When used to describe parents it is simply saying give them a little weight in ones decision making.Most have been through hell and have learned that youth and vigor will be meaniless on the day of judgement.
Like Solomon said in Ecclesiastics. Remember, which is to act in accordance to the Creator, giving those who have gone before a little weight .It can reduce the suffering for doing wrong. Suffering for doing right is like taking a short cut. When yoked with Christ he makes it easier..
Ecc 11:10 Therefore remove sorrow from thy heart, and put away evil from thy flesh: for childhood and youth are vanity.
Ecc 12:1 Remember now thy Creator in the days of thy youth, while the evil days come not, nor the years draw nigh, when thou shalt say, I have no pleasure in them;