If you develop geographic tongue, will it always be present with your tongue having patches for the rest of your life?

Probably: Geographic tongue is usually a permanent condition although its location varies. Some people think it is from yeast on the tongue. It doesn't cause problems.

Geographic tongue: Since we don't know the exact cause of geographic tongue, it may be with you for quite some time. The patches will change in shape, size, and location over time.

Yes, likely: We don't really know what causes geographic tongue, and it is something you will likely have the rest of your life. In may get more or less prominent at different times in your life. Most cases are asymptomatic (meaning it is harmless).