I just saw a patient who has the same handwriting as my father. My father has a very distinct handwriting. He prints everything in all capital letters, with the first letter of a sentence slightly larger than the others. Every letter is meticulously formed, evenly spaced, like an engineering diagram. I don't know why he writes that way, because as far as I know he doesn't have any technical training. That's just the way he is.
I can always tell when he's written something. It can be from 40 years ago or two weeks ago. If there's a caption on a picture, or a rating on a record sleeve ("NG" for "no good"), or a date on a letter, it's pretty obvious who wrote it.
I, on the other hand, inherited my mother's handwriting, which allows me to write fairly quickly, but generally requires a team of Egyptologists to decipher. Maybe the handwriting experts are right. Your writing does say something about you. My father: slow, deliberate, precise. Me: quick, sloppy, imprecise.
Anyway, this patient handed me a notecard with the names of his medications on it and I handed it back to him. Then I grabbed it back and did a double take. It was bizarre. Exactly like my Dad's. I told him this. I don't know if he was flattered or horrified. I hope it was the former.