Normally people who are in the same age category are lumped together. Like Brad Pitt is 57 and people say "Wow he's almost 60 already." Dwayne Johnson is 49 and people called him "Jacked for 50." You also see couples who are few years apart like a 38 year old woman and 40 year old man dating and no one see it's a big deal. 57 and 60 are considered the same. 49 and 50 are the same.
With idols, age differences even a year is a big deal. If the oldest is a couple years older than the youngest, fans will consider the hyung old and the maknae young. Fans will most of the time gravitate to the youngest even if the age difference is a little bit.
Why is age rounded in normal situations but in idol groups, the age differences are emphasized?
