At what age do you not need to bring ID to buy alcohol?

[dtemp]

The first time I bought liquor was on my 21st birthday and I didn't get carded. I felt really stupid afterwards. That was in Lubbock, Tx and while the liquor stores only carded about half the time, the bars carded always. But the liquor stores were owned by a select few (dry town, liqour only sold on outskirts) and they had a lot of power.

In Dallas its the opposite. I may not always get carded at a bar but always at a store. And for cigarettes also, which is kind of annoying since I never got carded for them in Lubbock.