How long has God been been around?
Here's the answer:
God has been alive forever.
"Forever" can be hard to understand. It means God was living before your parents, grandparents, or your great-great-great-great-great-great grandparents were born, and even before that. He was once the only one alive, long before He made the stars and sun, the earth, the animals, and people. After everything on the earth is gone, He will still be living. God is eternal, which means He has no beginning or end.
"Before you created the world and the mountains were made, from the beginning to the end you are God" (Psalm 90:2).
"Jesus Christ is the same yesterday and today and forever" (Hebrews 13:8).