These men were teenagers 18 years ago. They couldn't be too young in the present. It wouldn't make sense. And they are not playing band now. They each have their on life. Maybe they will play band later to relive their youth or something. But, that wouldn't be wrong either.
I've also read someone said Bowie does not look like someone in a band. . Bowie was in a band 18 years ago when he was a youngster. Can see from the flashback that his look was pretty hippy at the time. He has now changed to a proper vege eating union activist.
I also read another person complain about the dubbing of Tsui Wing's voice.