My son, do not forget my teaching, but let your heart keep my commandments, for length of days and years of life and peace they will add to you.
God's wisdom gives life. That is the promise given here to the person who will commit to diligent and personal obedience to the truth of God's wisdom. If we keep the principles of Proverbs in mind and bend our hearts to obey them, we will be blessed.
Three blessings are promised to us. First we are told we will be blessed with "length of days". I think this is more than longevity (given the other blessings mentioned) and more about a satisfying fullness to each day we live. As a general observation, God's wisdom brings satisfaction.
We are also promised "years of life". This is a full life. God promises to extend our lives through the practice of wisdom. Again, this is a general promise.
The final blessing is peace... peace with God and with others. God's wisdom brings a stability to life relationships that our selfish personalities will never know without God.