MA state taxes

A similar question was posted but I would like to clarify. I am a retired teacher from New York State now living full time in MA. I am 64 years old. Do I have to pay Massachusetts state taxes on my New York State teachers retirement system pension? I am reading mixed answers when I search. Most of my searches come up with if you are 59 1/2 or older you are exempt from Massachusetts state taxes. One search talked about a $20,000 exception. Thank you in advance!