Dude, the more you do, the better it'll get. I extended my vocal range by at least an octave back in the 90s by virtue of dylan pushing me to improve, and basically JFDI. Ok, it doesn't sound pretty (and I've lost a lot of it by not singing much for years - which supports my main contention), but I figure that's ok if you just belt it out confidently.
btw, I've just looked at my previous post, and it was a bit muted.
![Neutral :|](./images/smilies/icon_neutral.gif)
What I should have said is that was fewkin' great!
![Cool 8)](./images/smilies/icon_cool.gif)