You can recover from anorexia at any age. Check out this article by the AARP: https://www.aarp.org/health/conditions-treatments/info-08-2013/midlife-eating-disorders.html.
In June 2012 the prestigious International Journal of Eating Disorders published the results of a seminal study on the prevalence of eating disorders in midlife and beyond.
Lead study author Cynthia Bulik, Ph.D., director of the Center of Excellence for Eating Disorders at the University of North Carolina, Chapel Hill, found that 13 percent of American women 50 or older experience symptoms of an eating disorder; 60 percent report that their concerns about weight and shape negatively affect their lives; and 70 percent are trying to lose weight. Those figures mirror the rates found among teens and young women, says Bulik, author of Midlife Eating Disorders: Your Journey to Recovery.
I counsel clients who are over 50, have families, and have had eating disorders for decades. They are all making great progress toward overcoming their illnesses.
It doesn't matter how old you are, when you got eating disorders, nor how long you've had one. You can recover.