My dad is in the lower left; born in 1898.
His brother is in back; born 1896.
A cousin is on the lower right; age unknown but close to the others I would guess.
Boys did wear long curls then and how about the large plaid bows?
I remember reading in a book about Gen. MacArthur that his mother had him wear his hair in curls, making it seem that this was a unique thing she did. I believe it was just a sign of the times.