I cut off contact with my parents 11 years ago, at the age of 43. My therapist at that time supported me in that decision, thankfully. My mother has not stopped trying to contact me despite me making it very clear that I no longer want to hear from her or my father. Fortunately, I have a loving spouse who has been willing to listen to the messages she leaves on the answering machine and otherwise shield me from contact with her, which always leaves me upset.

(In short, my decision was due to prolonged sexual abuse by an older relative - not either of my parents - that I endured during my childhood, and how my parents handled and reacted to my revelation of that happening. Among other complicating factors.)