Genesis 12:2-4 “I will make you into a great nation and I will bless you; I will make your name great, and you will be a blessing. I will bless those who bless you and whoever curses you I will curse; and all peoples on earth will be blessed through you. So Abram left, as the Lord had told him; and Lot went with him. Abram was seventy-five years old when he set out from Haran.”
The Lord built his entire nation through the faith of one servant, Abram (see Genesis 15:4-5) and Abram was seventy-five years old. As you hold the scriptures in your hand, remember, that all this unfolded through Abram. No person is ever too old to serve. God calls each person for His own glory.