What do I call my Aunt's partner?

My Aunt who is in her 60's came out a few years ago and got her own house after being married for 30 years. She recently started seeing someone and they will spend most nights together at the new house. <br><br>She told me that she doesn't like the word "girlfriend" because it feels like they are 25 years old again. But when her partner is in a room I feel really bad saying "my aunt" because it feels like I am forgetting this person. <br><br>I don't want to sing "I'm through with playing by the rules of someone else's game" and call her something weird like partner. I just want to know the most commonly used phrase in the LGBTQ+ community.