At age 80, Moses was entrusted with leading Israel out of Egypt. Despite his failures, including striking the rock at Meribah (Numbers 20), Moses pressed on to fulfill his purpose. One of his final tasks was completing Joshua's training and commissioning him to lead Israel into the promised land.

Jesus called Peter and John away from their work as fishermen to follow Him and become "fishers of men" (Matthew 4.18-22). Though we don't know their exact ages when called, Christ's call on their lives was a lifelong commitment.

Daniel served under Babylonian and Persian rulers for at least 65 years. In his 80s, he was still going strong, battling in prayer against spiritual forces (Daniel 10). The angel Michael gave him these final words: "But as for you, go your way to the end; then you will enter into rest and rise again for your allotted portion at the end of the age" (Daniel 12.13).