Am I Looking younger than my actual age?

Haha...yesterday my colleague was asking how old am I. She is 20 years old and she thought that I am younger than her....can you imagine?? hahaha... I am not sure if she looks more mature than her actual age or I look more kiddie than my age. But somehow I am happy to hear such a comment that I still look young....as long as what she meant was my outlook instead of my thinking and mindset.