Definitely, there are two:
1) Casa de Luz. Their prices are about to go up unfortunately from $10 to $12 a meal ($14 for weekend brunches). They're pretty much a health-oriented place based on a dietary philosophy called macrobiotics. All of their meals except brunches are done like a home meal, meaning that they serve you a plate of whatever they are having that day. You can go up and get seconds. Some are really good like Wednesday lunch is Mexican, Thursday dinner is Guatemalan, and first Monday of the month dinner is vegan sushi. Also, they have a really good brunch on Saturday and Sunday from 11:30 to 2:00. Please keep in mind that sometimes you will get a bland meal if you go at some other time, but many of their meals are delicious. It's somewhat pricey, but it is good to try a few times before you make up your mind. http://www.casadeluz.org/www.casadeluz.org
Also keep in mind that many of the people that here are totally new age or old hippies. That is usually okay, but it got to be a big turn off when I ate there a lot more than I do now.
2) Nu Age (haha...kinda funny after I was talking about the New Age people at Casa) This place has not been around very long. I was pissed because when they first opened they had honey in some of their dishes; however they have replaced it all now with agave nectar. Their menu doesn't reflect this, but I have been assured that this is the case by the owners and a friend that works there. Food is really good here for the most part, but it is way expensive (many dishes are $15!!). Still it is very yummy. The decor is pretty bad, and some of the dishes are uber sweet. Regardless I like this place a lot! I recommend the Malaysian Roti Prada ($8) or Sesame Seitan ($15).
If I had money, I'd open a vegan diner with 24 hour service and reasonable prices. Hmmm....maybe some day. http://www.nuagecafe.com/
Hey, we have a vegan group called Vegans Rock Austin! We meet up once or twice a month. Most of the group is in their twenties, and then there are some (like me) who are a little older. I'd like it if we could get some people coming to represent younger vegans especially since I know there are lots. You should totally check out and register on our website: http://veganaustin.org