Well, what do you want your "brand" to be? If you think it might not be pleasant to some, are you OK with that? Voice is very much a construct that attracts readers to written material. We all have a voice or "brand," which is really just another word for it. Why does this annoy you? It does help to think about how you project yourself to various audiences, whether it be through writing, speaking, or even the way you are dressed. These are all things that help others decide if and how they want to connect with you. Humans generally seek to be around others with whom they have something in common. So, if you are applying for a certain type of job, in a certain environment, it probably does help if your brand matches that of the employer.
I think this even more important for older people wanting to up their career, or change fields. I certainly thought about it when applying for my first job in my new career and it was definitely something I talked to the career services office about at my university. In my field, many of the people my age are technophobes, and with the advent of electronic medical records, this is not good. And as we know, a lot of older people aren't exactly fit looking (although this certainly applies to most age groups in the US). The career services director told me to include my volunteer bike leadership role on my resume, as it gives a cetain impression of who I am. She was right.
I am older than you, Shooting Star, and I think this is important. I would not want even casual work colleagues to have a negative impression of me.