Imagine your gallstones like multiple big cows scattered on a highway, right now they're not causing you much of a problem but if someday if these cows roam around and move to an narrow area it may cause a traffic jam, which in your case may be cholecystitis (inflammation of the gall bladder) or if they move into your bile duct, it may cause jaundice and bowel issues. It may happen when you least expect it, but if you've been asymptomatic for a long time they may be termed silent gallstones.
Next Steps
you should consult a general surgeon about the size and location of your gallstones to determine the risk of them causing the above problems. if they're silent gallstones they need not be operated, you may live with them for your whole life without much issues.
Health Tips
if you notice abdomen pain fever vomiting jaundice or any such symptoms you should rush to a hospital quickly and let them know about your gallstones.