When I was 65 with ER/PR+ breast cancer I was told to take them, however I chose not to because it was only a slight decrease for recurrence for my tumor parameters. However interestingly enough there is a study that over the counter Claritin and one other H1 antihistamine helps with preventing recurrence. Do some research, the side affects of the AI's and Tamoxifen are real and really need to be weighed against the benefits. Link to article below, I'm more than happy to take Claritin aka generic Lortadine every night before bed time, only side affect is I get a good nights sleep 🙂
https://pubmed.ncbi.nlm.nih.gov/32459128/