User blog comment:BlackWizardZeref/Fairy Tail Review Chapter 465: 400 Years/@comment-162.157.239.172-20151207225037/@comment-24039250-20151209234321

But the Year now is X792...In X777 they were probably 4 years old, In X784 they were 11, In X791 they were 18, and now they are 19.