Talk:Megumin/@comment-27654351-20170304064636/@comment-108.185.107.51-20170310080125

She's absolutely 14, and 13 at the start of the series, and Kazuma is currently 17 and started at 16. It's clearly stated multiple times during the LNs and in the anime, and both characters celebrate their birthdays during the story.

There are also several occasions in the LNs where Kazuma talks about how he's not old enough to drink in Japan but drinks all the time in Konosuba's world. He even admits that he's a hypocrite for stopping Megumin.