I was 28, my neighbor's brother was 52 - BOTH type 1. The misinformation that only children get type 1 diabetes has actually killed some people because they were misdiagnosed and not started on insulin. They misdiagnosed me, said I was "too old" for type 1, but then again "way too thin" for type 2, but still treated it as type 2 until I was almost dead.
I actually know more people diagnosed with type 1 past the age of 25 than under the age of 25.