How old can you be to retire from being a family and marriage therapist?

I also want to know the salary after five years and ten years of experience? What kinds of opportunities do employees have for advancement in their career?How old can you be to retire from being a family and marriage therapist?
Depends where you are located - wages differ in different areas. City expenses are higher as are wages. Unless you are a public employee who gets automatic wage increases dependent on length of service, you are not guaranteed income by being self employed. And you can retire whenever you have saved and invested enough money to support your retirement. But that is not a sure thing either - look at how much has been lost in the stock market these days. People were depending on those investments to fund their retirement and it is now 50% of what it was.