Fed Income Tax for older seniors

My husband and I both are 71 yo.  We have social security and one pension.  We are both retired and do not work extra jobs.  Is there an age limit to being taxed on the pension?  Our social security appease to not be taxed.  I had heard that there was one many years ago.   Something like 80 yo.  We live in Washington state which does not have state tax withheld..  Thanks