Question: 52 year old woman with parathyroid adenoma

I’m a 52 year old women in pretty good health. I just found out I have a parathyroid adenoma and several nodes on my thyroid. I had kidney cancer several years ago (healed with surgery) and then a couple years later, melanoma was found on my back over my spine about the size of a fifty cent piece. It was removed. I just had a doctors app with an Endocrinologist and he said because I was over 50, he wouldn’t remove the adenoma. I’m confused. Why would it be okay to leave the adenoma, especially with my history with cancer?