There are a few things I consider when I'm reading a post from someone. Your age plays a great deal in your voice. So younger guys don't have a deep gravely voice.
Mine has changed alot over the years. Mines deep, and at times the wife says, ( sultary ) sexy and seductive.. mm daddy likes that...( smile ) ok enough of that.. ah hmm ( clearing my voice),,,
I also look at how someone's wording is . And there F-ing SPELLING, dam it, You know who you are to.. lol,,j/k
Anyway that's my determination of that schitt..
I don't think anyone sounds childish. But more mature and even toned.
I bet that all would change if we talked on a phone..
Chris