Board Thread:Manga/@comment-29919227-20160909220906/@comment-5774380-20160909232046

Zeke only looks older because he has beard and mustache, but come on, all men look older when they do this, but then they shave and voilá, instant rejuvenation. If you look closely at Zeke's face, it's evident that he's a young man in his 30s or late 20s, since he has not even the smallest wrinkle. Also don't get deceived by his hair color: he's not hoary, he's just blond.

And remember that Grisha died 5 years ago, which means Zeke could have been born when Grisha was in his 20s, then assuming that Grisha died at age 40-45, Zeke would be now 25-30. Perfectly possible.