I've had people tell me my voice is monotonous and lifeless at times, plus people have frequently mislabeled me as older when they hear me speak... so I'd say generally...
I sound a good 2-3 years older than I do when I talk in long sentences or something.
I don't care though because once I got into an adawlt ratid movie (in my region anyways) about a year ago for my friends and it was awesome.
The lady was like "Uh, sir, you can't pass yourself off as a child."
"watohoksure"
>Pineapple Express