Wow, seems there are lots of misconceptions about tongue piercings.
I've had my tongue pierced for 9 years now. Most people I meet don't know I even have one (and honestly I've never even met one person that does have one that I could tell by their speech..), most of the time people don't realize until i'm either laughing so hard that I open my mouth wide and they see it, or I'm yelling with my mouth open and they see it. Infact, my parents didn't even know for 2 months that I had had it done, until one day we were all sitting around laughing. Most of the jobs I've had it was months before the people I worked with even knew.
Also, I've never once chipped a tooth with my piercing, and considering it's a 4g (which is larger than the average tongue piercing), I'd venture to guess that not THAT many people actually do chip their teeth. Again, I know a lot of people that have had them, and never heard about someone chipping a tooth. I've also been to atleast 3 different dentists since having it (fillings/checkups/cleanings) and not one of the dentists has ever made mention of how it could be detrimental to my dental health.
Also (as per the other thread), I did not get my tongue pierced to be different, I manage that just fine on my own. I got it because it seemed interesting. I think tongue piercings (if done correctly, with certain barbels) can look very nice. It was my first piercing (aside from ears), and the piercing experience can be very exciting and thrilling (much like riding a rollercoaster).
As for what it will look like when I'm older, well it will probably look exactly the same. Considering it hasn't changed much in 9 years (aside from the modifications I made to it), I doubt it's going to look much different in another 9 years, or 20 years, etc.
My mother was adamently against my getting pierced, but I went ahead and did it anyway. She was so hell bent on thinking that people that did these things were 'trashy' or drug addicts, or couldn't get a job after they did these things, and other random things I've seen mentioned on this thread. Since then she's realized that I'm a good human being, it doesn't change that. It doesn't change my love for my family, and luckily for me she opened up to it and decided it wouldn't change her love for me either. I think now she thinks it was almost silly to think something like that could make a person into something else.. I hope I've helped some other people realize this too.
tricia.