The disease isn't designed at any particular age. Its open to 9 mths - to 90 years.
Unfortunately, thyroid issues aren't "age particular"....... they can hit anyone, at any time.
Yes, it's possible, but consider yourself fortunate if you do have it and get a diagnosis this early. Many of us went yrs w/out a proper diagnosis, and received labels such as panicky, paranoid, ADD, etc. It can be properly managed if you have it, and is not a death sentence or anything. Most ppl go into remission for yrs and yrs.
I was diagnosed with Graves at 19.