how the actual f is inoo kei older than mackenyu

they both acted in peach girl movie (2017). recently kei posted a picture of him and mackenyu on instagram. i will never be able to register the fact that kei inoo is 33 and mackenyu is 27??? like thats a solid 5 years gap between the two. mackenyu looks his age, maybe one can call hiim 30 as well. but how the heck is inoo kei 33, he doesn't look a day older than 19