Yes--there's an asymmetry there that skews perceptions I think. Of course we know that T2 is disturbingly rising among the young, but as a rule it's still something you're much more likely to get in middle age or older, and so it actually makes almost as much sense to call T2 "mature onset" as in the old days, whereas referring to Type 1 as "juvenile" makes almost no sense given that nearly 50% of cases aren't juvenile at all. The fact that Type 2 accounts for the great majority of diabetes cases overall tends to lock in the perception that "adults get T2 and kids get T1," even if only the first half that proposition is more or less accurate.
This is a great irony to me. I was dx'd in my 20s with "juvenile type" when the old terminology still held sway, and I was very keenly aware of the new designations coming in and very hopeful they would clarify some of the misperceptions that drove me crazy. But what seems to have happened is the exact opposite. Instead of replacing the old Juvenile vs Mature onset concept, the T1/T2 terms seem to have just been mapped onto it as if they were just another way of referring to the same thing, even among physicians. The nomenclature has been warped to fit the misperceptions instead of correcting them.