There is Luke Hemmings who is 17 but turning 18 in July, Michael who is 18, Calum who is also 18, and the oldest Ashton who is 19 but will be turning 20 in July
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The boys are all around the same height, about a little over six feet.
well there whole group started in 2011 hope thats a big help
Michael Clifford, one of the members, came up with it while in a science class. There isn't a specific reason why, but they had a list of band names. They chose 5 Seconds of Summer. :) In a Youtube video, called "5 seconds of summer info !" it shows him and his band member, Luke, trying to figure out a name.
Ashton Irwin
pop rock