C.H. Spurgeon emphasizes the inclusivity of Christ's call to work in His vineyard, particularly for the elderly, who may feel overlooked in society. He highlights that even at the eleventh hour of life, there is still an opportunity for service and that God promises fair wages, which include grace, comfort, and glory. Spurgeon encourages older individuals to respond to this divine invitation without delay, assuring them that their contributions are valued and rewarded by the Lord. He expresses a desire to reach out to unsaved older individuals, sharing the good news of God's mercy and grace available to them.