Charles Ellicott Commentary Proverbs 3:2

"For length of days, and years of life, And peace, will they add to thee." — Proverbs 3:2 (ASV)

(d) Fourth Discourse: Exhortation to Various Virtues (Proverbs 3:1–18).

Long life—That is, a life worth living, fit to be called “life”; whereas “length of days” only implies extension of life, the reward promised for obedience to parents.