Board Thread:Wiki/@comment-34960117-20180310195423/@comment-32261140-20180310203341

Levi has not had a precise birth year specified. We only know that he was in his early thirties in 850. Now, 4 years later, he is in his mid thirties. Unless it's currently December 25th - 31st in the manga, he's at least 34 btw. (I doubt this by the weather)

If you don't have a source, bear in mind that head-canons aren't added to articles on any competent wiki.