I have also chosen not to take the meds, because the increase in probably protection is minimal and because of the possible side effects (I already experience joint pain periodically and am not interested in another menopause!). It’s more a quality-of-life decision, because the increase in probable protection is so small.
I’m 73, Left breast DCIS, stage 0, highly estrogen positive and aggressive cells. The tumor did not leave the milk duct. Lumpectomy was Dec 12, wide margins. Pathology on margins, left and right breasts was negative. I had 16 sessions of radiation, which the radiation oncologist told me would bring me up to about 90% unlikely to get a recurrence. The AI would have added about 5% or so. To me, not enough at that point for me to do the AIs.
Good wishes for a successful outcome, whatever you choose to do!