That was the awesome part about playing football in college, people hooked you up .. I've been 21 since I was 17 .. I had a sick as Kansas DL .. My name, pic, etc .. all that was different was that it said I was from Olaetha, KS .. Somehow my buddy's friend got ahold of a card printer and found a site to order the holograms ( excuse my spelling ) ... so I went to his apt. he took my pic 5 min later .. I had a DL that I used everywhere ... even though I didn't get carded half the time b/c I was 6'8'' 300 something lbs at the time ..
back to the topic .. I didn't know there was an age .. I've been getting my bottle filled since I was 18 .. never even thought about getting carded ...and as far as hiding it .. don't pop your hood around your parents .. and keep the tank out of the car unless you're using it .. and if they are gullible .. tell them its just CO2 to cool down the radiator or something ..