Some people believe God is eternal, existing outside of time with no beginning or end. That would mean God had no beginning and God had no "First Cause".

If we were little fish trapped in a little pond, we could not understand how big the Earth is, we could not understand how the Earth works. That's how I feel when I try to understand an infinite Universe or an infinite God.


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AI Overview
How Old Is God? How Old Is Jesus? (Age Secrets)
God doesn't have an age because God is considered eternal, existing outside of time with no beginning or end, unlike created beings or the universe itself, which God created. In Judeo-Christian traditions, God is described as the everlasting Creator, existing "from everlasting to everlasting," making the concept of age inapplicable, as age implies a starting point, according to sources like Taylor Bible Study and thirdmill.org https://thirdmill.org/answers/answer.asp/file/50165,.
Key Concepts
Eternal: God's existence is without beginning or end, existing forever.
Timeless: God is not limited by time as humans are; to God, a day can be like a thousand years, and vice versa, notes WatermarkWaves and GotQuestions.org https://www.gotquestions.org/how-old-is-God.html,.
Uncreated Creator: God is the source of all things, including time, so God cannot be subject to time, state sources like WatermarkWaves and Compelling Truth https://www.compellingtruth.org/how-old-is-God.html,.
Scriptural References
Genesis 1:1: Establishes God as the uncreated creator of the heavens and the earth, notes WatermarkWaves.
Psalm 90:2: Mentions God's eternal nature, "Before the mountains were brought forth... from everlasting to everlasting, You are God," states bibleinfo.org.
1 Timothy 1:17: Calls God the "King eternal, immortal, invisible, the only God," according to thirdmill.org and bibleinfo.org.