It would be helpful to understand why you have been on Depoprovera for 8 years at age 25. But to answer your questions, the eggs are not saved up. They continue to be produced but do not mature. It should not affect when you go through menopause. However, if you are on Depoprovera, it will be hard to know when you go through menopause because you probably don't have a period and it will affect your other hormones which are measured to tell if menopause is near. If a woman stays on Depoprovera for a long time, sometimes her period will not return, even if she comes off of it. Be sure to discuss this with your doctor.
Machelle M. Seibel, MD