My DS18 got his permit at 15 and 9 months; my DS15 is eager to get his right on time, as well.
It is definitely a trend with kids this age to delay getting their licenses. Kids, in general, are delaying many of the milestones of growing up and gaining independence.
https://www.theatlantic.com/magazine/archive/2017/09/has-the-smartphone-destroyed-a-generation/534198/
"Even driving, a symbol of adolescent freedom inscribed in American popular culture, from Rebel Without a Cause to Ferris Bueller’s Day Off, has lost its appeal for today’s teens. Nearly all Boomer high-school students had their driver’s license by the spring of their senior year; more than one in four teens today still lack one at the end of high school. For some, Mom and Dad are such good chauffeurs that there’s no urgent need to drive. “My parents drove me everywhere and never complained, so I always had rides,” a 21-year-old student in San Diego told me. “I didn’t get my license until my mom told me I had to because she could not keep driving me to school.” She finally got her license six months after her 18th birthday. In conversation after conversation, teens described getting their license as something to be nagged into by their parents—a notion that would have been unthinkable to previous generations."