I agree with Kathy and Bonnie on the use of the word “senior”. “Older adult” is probably the most preferred. However, I also think when you're invisible in this conversation anyway, it's really important to address some of the other issues around intersectionality to be more inclusive. I think most of the LBTI2S seniors or older adults would just like to be included in the conversation in a more positive, empowering way.
If you're looking for a more standardized approach in how you address this issue, I would use the words “older adults” and “elders”—but please include us.