In this situation, it's understandable to feel a responsibility towards the younger buyer. Ideally, you could have politely mentioned the pitting you noticed and suggested the buyer consult a gunsmith before purchase. This would have given them a chance to make a more informed decision. However, approaching a stranger after their purchase might be unwelcome. It's best to trust the store's expertise and hope the salesman didn't mislead the buyer. If you know the store owners well, you could mention the situation later as a friendly heads-up, but avoid criticizing the salesperson directly.
