At what age can a kid have a credit card? 18 years old18 years old in the U.S., but parents can opt to sign up teenagers younger than 18 as authorized users, depending on the card issuer. Related posts: Can my 13 year old get a credit card? How do I pay my TJX credit card online? Can you buy gift cards with credit cards at Walmart? Can I add money to my Home Depot gift card? Maximizing Your Lowes Credit Card: Exploring Gift Card Purchases Exploring the Versatility of Your Synchrony Home Credit Card: Where Can You Use It?