User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-3315689-20130919150835/@comment-4979838-20130919175118

Shagaru is an elder Dragon becouse its past the point of aging like any type of monster can be an Elder draggon  you could call many monsters other things then just Elder Dragon like clearly the shantien is related to leviathans but hes an elder dragon becouse hes reached that rank of mythic power and age, the base of elder dragons was meant to be 4 legs and wings and if you look at the monsters with 4 legs and wings thy are nearly all elder Dragons .anyway to put it short to be an Elder dragon you got to be old Elder