Market what you are good at and why you are good at it. While being attractive or young may give an advantage initially, skills and abilities will be the most important attributes in the long run.
Education is the only way to acquire more skills and abilities. I know that in my area, there is literally no one else with my skill set. No one can deliver the services that I can. It took time for people who need my services to see my ads or hear about what I provide. But once I was established and built a history of providing unmatched services, most of my business came to me by word of mouth.
I am as busy as I want to be. My workload cycles a bit, but I market/advertise my business just enough to keep my numbers where I want them. If things slow down more than expected, I would do more marketing in response.