I was 32 when diagnosed and had all my treatments at that age.
I had no risk factors: Never smoked, dipped, used anything with tobacco, don't drink alcohol. They even tested for
HPV and it was negative. Only thing they said that has a remote chance of causing my cancer was that I had adult braces and one of the rubber band hooks but my tongue a few times close to the spot I developed cancer. A repetative injury can sometimes lead to cancer but they thought it was highly unlikely that was the cause and of course could not prove it.
Jim