Your AMH level is well above average in your age group. It is really good news. AMH is usually high in patients with PCOS as by definition it means high follicular activity. There is no test to predict when your ovaries will decline their activity and especially when you will go through menopause. At the moment the best predictor is to ask your mum and any older sisters. If no one went through menopause before age 45, then you do not need to worry.