It's not a stretch, generations generally span about 15 years and millennial is what people settled on. I'm 32 and we were always part of generation Y/millennials.

Most sources put the end of generation X as 1980. So unless you want to come up with a micro-generation for people born between 1980-1985, we're stuck in the millennial group.

The thing is that if we stick with a 15 year span, the youngest people who should really be called millennials are around 21 or 22, but it seems like each year the lower bound for millennial grows (I occasionally see news reports referring to children as millennials).

I'm assuming this trend will stop when we settle on a name for the next generation.

Yet rotary phones were still very common in the 80s, and my grandparents still had one in the early 90s. So people born in the early 80s, which qualifies as millennial, very likely used them.

Until 2000-something (and they might still have it) the Harwich MA public library had a rotary phone that patrons could use to make calls. The typical use case was middle schoolers who's parents forgot to pick them up (the middle school ran a bus to the library) when the library was 30min from closing.

Yep, my grandma had a rotary phone until well into the 90s. She was still paying the phone company to rent it as well.