I invested about 8,000 dollars in my daughter's voice. She started piano and dropped it. She couldn't sing but had an instructor with a Master's Degree in Music as a vocal coach. There were scales, exercises, breathing lessons, warm ups, tips for singing with a cold, sight reading, and tons of other stuff included. And this is at a very low level, you can go to any great music school and pay 50k a year for voice lessons.
So I TOTALLY disagree you have to be born with it. Anyone, given 2 hours a day work, a good teacher, and proper preparation, work ethic, and support can learn the instrument called voice just like they can learn the clarinet.
Our local university has a Dr. of music (and she's a good friend.wings and beverages once a week) who has written a book on singing for seniors, and runs such a program for seniors.
A voice is an instrument. Mines damaged. (Radiation burns) And I'm still trying. Very trying.
Just ask the wife.
My daughter went from a very poor singer to a passable one. At the present she's too much into other things, like trying to figure out how to leave home at 20 and still travel the world with her friends.