You keep adding in ( Immunity to being Aged ). That is not included in Endless. Endless is only a RP flavor trait that means you don't naturally age. It doesn't make you're immune to magical aging or aging attacks. Seems we are having a miscommunication there. Regardless it's fine, I'll just drop it.
And as far as the spell, that's perfectly understandable.
And as far as the spell, that's perfectly understandable.