first post on here, i was contemplating on even posting this but i need some sort of point of views. 

So I (20f) started talking to this (33m) from an online dating app and honestly was very  attracted to him from the beginning. Well, fast forward 8 months (now) and we're together and everything is great. Well, mostly everything. In the beginning, i told my mom about him, not too much information just the basics of him. Then she asked how old.... I kinda froze but didn't make it too obvious and just blurted out that he was 28. I have no idea why but i just kept it up thinking he and I wouldn't have ended up together 8 months later. He knows that i told my mom he was 28 and not 33 and he seemed uncomfortable then kinda understood why i would lie about it.  But i feel like an asshole.. i mean eventually i wanna have him around family events and stuff, i just don't know if i could go back from that and it feels shitty.

Am I the asshole for lying about my boyfriends age to my family? Mostly my mom, who i feel like knows something is up 