I have a vestigal driver's licence from growing up in the suburbs (which I never really used, opting to bike instead, but my parents were pretty insistent that I get one, so...) and I found your post interesting (actually a friend forwarded it to me) because I got a firearms license specifically to highlight the absurdity of having a driver's license (and people's assumptions about everyone having a driver's license -- ended up enjoying the sport of target shooting too). When I was still easily mistaken for someone underage, I'd often have conversations that followed along the lines of:

"May I see some ID please?"

"Here you go." (handing over firearms license)

"Umm, what's this?"

"It's a firearms license; government-issued photo ID."

"Do you have any more normal ID?"

"Like what?"

"Well a driver's license?"

"Are you crazy? Cars kill people"

(Sometimes the person carding me was really on the ball and would respond "Cars don't kill people, people kill people")