As humans, we measure age based on the date we were born, but that method doesn't translate to measuring God's age because He doesn't have one. God has always been and will always be. Therefore, He is beyond time or age; and not only that, He is the inventor of time.
God is the creator of the whole universe and all it contains (John 1:3). Time itself is a creation of God by which we are able to measure our days, years, and the seasons as they pass (Genesis 1:14; Psalm 104:19). Because God is the creator of time, He exists outside the realm and confines of time. When He first spoke to Moses, God called Himself "I AM WHO I AM" (Exodus 3:14). This statement is related to the Hebrew name for God YHWH, or more commonly, Yahweh. By calling Himself "I AM" God was showing Moses His supreme rulership, limitless power, and His never-ending presence. He is the God who always IS.
Jesus lived within the limits of time while He was here on earth, but that was merely His physical incarnation. Before Jesus was ever born on earth, He IS God and was with God, creating the world (Colossians 1:16; John 1:1–3). Before Abraham was ever born, Jesus IS "I am" (John 8:58).
In the Old Testament and the New Testament, the Lord reveals Himself to be "the first and the last" (Isaiah 44:6). He is "the Alpha and the Omega, the first and the last, the beginning and the end" (Revelation 22:13; cf. Revelation 1:8). In the Greek alphabet, Alpha is the first letter and Omega is the last letter. So, in English, the equivalent saying would be that He is the "A and the Z." We are bound within the confines of time, but God isn't. He was here before the beginning and He will be here after the end, and in all of it, He is always present.
Asking "How old is God?" is thus a category mistake. As explained, God is outside of time; He does not have an age. Wanting to know how old God is, is like wanting to know what the color blue sounds like (colors are not audibly perceived). The question "How old is God?" assumes He has an age, but because He is timeless and eternally self-existent, He is not in the same category with things subject to time, with things that have an age.
We have a God who has always been and will always be. When we put our faith in Jesus Christ, trusting His sacrifice on the cross and believing in His resurrection so that our sin can be forgiven and we can come into relationship with God, we can rest confidently in God. We know that God is always with us and will never leave us (Hebrews 13:5–6); we know that He is faithful to complete His good work (Philippians 1:6; 2:12–13); we know we can never be separated from His love (Romans 8:28–39). Our future is secure when we put our trust in Him (Psalm 9:10; Proverbs 30:5).
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