How old were you when you started going to high school parties?

my sister had a party the other night and wouldnt let me be there. She thought itd seem like i wass tagging along but id just be there not tagging along! i have my own friends thank you. anyways my dad said"youll have your own time to go to parties your too young..." im 15 he started going to parties when he was 13... ahg it jus makes me so mad that he treats my older sibs diff than me n my lil sis cuz theres such an age gap between us its like they raised the older ones n they didnt give a **** n now they have rules for us younger ones its so annoying but like sometimes they wont care wat we do its so bipolar.... back on topic how old were you and do you think its fair???