Never said I'm younger (I'm 30 now) but was never worried about age. When I was 16 and 17 and in pubs and nightclubs I would lie saying I was older.
I remember when I was 16 was in a pub and chatted up an 18 year old (which seemed way older at the time
). Told her I was 19 and studying theoretical physics in MIT. She lapped that shit up. I don't know what I did with her or what I drank/ate towards the end of the night but was puking pink stuff the next morning and pretty sure she was wearing a pink jumper. Saw her some months later when I was in my school uniform and she had the same look as Bruce Willis when he realises he is dead in the 6th sense.