"You look more matured..."

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What do people mean when they refer to someone as "matured"? Well there have been some incidents suggesting that I look more matured than somebody else, like for instance, there is someone from church that have continuously mistaken me to be my brother's elder sister. Despite the height and I would have to believe that I do not look older than him. Hahaha. An office mate of mine who is a year older than I am talks to me using "po" and "opo". I have told her not to since I am not used to it and also since I am younger than her actually. My other officemates often refer to her as that "child" or "kid" when saying something or talking about her, and when I joked that how come they refer to her like a kid when in fact I am the youngest of our group, our boss said cause I look more matured than she does. In my own preference I like people who are matured, and also like the idea of being referred to as a matured person in the sense that they are over the cartoon days, the childish behaviors, the running away from responsibilities, the I-cannot-dress-myself-up-properly type. But then again, in your own manner of passing judgement why or how do you say that someone is more mature than somebody else? Usually at what perspective do you look?