lol yes I am 24 and yes I do look a lot younger I get ID'd everywhere, in Egypt I was even offered the childs menu LOL!, "Peter Pan Pizza Young Man?" ......
I had a tummy tuck as previously I was 20.5stone and lost 10 stone when I was 21 years old in around a year. I had a 44" waist etc so when I lost it I had a small amount of loose skin so had it removed etc.
Spoken to my surgeon though and he cant explain the muscle growth there, except he said you must be doing weight training on them.... however I am not, but there is nothing remotely linked to this and the operation.