Humor ages differently from affection, so an old joke may need a new judgment.

Affection lasts better than comedy. A running joke from twenty years ago can still carry real warmth and also carry an assumption nobody would make now, and those two facts sit together without cancelling each other. Recognising that a line has aged badly is not a verdict on the people who made it or on the friendship it belonged to.

You can keep the fondness and retire the material. If something you have always said lands differently these days, let it go quietly rather than defending it, and find the current way of saying what it used to say.