If you put “the first …” or the “youngest” or the “richest” in your tagline or bio, be sure that’s what you want to be known for.
I was looking through authors on Medium and wondered, does that person really want to be known as “the youngest mayor”? Does he win Millennial votes that way? If not, what advantages does being young give him in the voters’ eyes?
If you are going to brag about being “the first” or “the most-est”, make sure it’s what you want to be known for! What you are proud of and what you want to known for might be two different things.