I'm a man in my 40s. My eldest daughter is 17. We have the same first name (spelled differently, at least) and have had many cases where medical records have gotten confused.
We always double-check dosages for medications before taking them.
When I was 18 I got called up for jury duty along with someone with the same name and age. It was confusing. They started referring to us by the suburb we lived in. Luckily both of us got passed over.