If you're thinking of going into sales, if you're already in sales, if you don't know what you want to be when you grow up (no matter your present age!) there's a top-rank article you need to read in the magazine FAST COMPANY.
It's "Why smart people should go into sales," by Andrew Yong, and among his accomplishments include authorship of the book, SMART PEOPLE SHOULD BUILD THINGS.
I'll leave the article to you, but add that "selling" is not just selling products or services, but it's also persuading, reading body language and other buying signals, pulling out objections and hesitations, presenting concepts, learning to find and fill needs (needs that often the other person isn't really aware of, so part of "selling" is showing the need and how you can best fill it). All of these abilities pay off many times over if you move from sales per-se to management, customer service — even to setting up your own business and marketing your skills, perhaps as part of career reinvention, or electing for self-employment as your new career option.