It's a form of inner wisdom not mediated by the rational mind. People may experience it as a gut feeling, a hunch, or a physical sensation. I experience it as snapshot-like flashes, or a dream. But however it comes in, it just keeps an eye on our bodies, letting us know if something's out of synch. People associate it with the psychic phone lines and fortunetellers, and that's not at all how I'm using it.
Some people are born with it, others develop it as they get older.
I've worked with women in their 90s who want to start developing their intuition. So it's not an ageist kind of thing. It's not as if you don't develop it the first 50 years of your life you can't have it. You can develop intuition at any time in your life. Be in your body.