in the official piggyback guide it says that auron is 35

if the calm lasts 10 yrs and since auron is frm yuna and co's time
and yuna is 17 now and 7 then so thats + ten yrs. which means that auron must be - 10 yrs cause he died before the grand summoning so he wud've been 25 at the time

he is very gray 4 a 35've yr old tho. Death does that to u i guess

So that means that both braska and jecht must've been older than auron