Hm-m-m-m... coming out... you mean as in your sexual orientation? I guess I don't have any particular resources I can suggest to you. What I can tell you is that I've waged a life-long struggle with gender identity dysphoria.

I'm now 70 years old. And my GID issues are still there. (As I've heard it said on numerous occasions, if you're trans, you're trans for life. It never goes away.) And, anyway, I "came out"... or perhaps it would be more descriptive to say I "came lurching out" about 10 years ago after a lifetime of hiding deep in the back corner of the proverbial closet. (It's a long story.)

I do believe you're correct with regard to stuff out there being for young adults. I've found the same thing with regard to my GID issues. There was really almost nothing I could find that was relevant to me, as an older person, when I was looking. (I'm not anymore.) Actually, in my case, YouTube ended up being my own best resource at the time although that has changed too over time. I doubt it would be nowadays. Since then, I've looked at a few trans-related forums on-line & actually joined one for a brief period. But they haven't seemed to be anything that would be relevant to me.

Here is one resource I was able to find. It is a link to a webpage from the National Resource Center on LGBT Aging that addresses the issue of coming out later in life. Perhaps some of the information that is on offer there will be of some help:

LGBTAgingCenter.org - Featured Resources

Anyway... my best wishes to you with regard to this. In my own case, after I did unexpectedly come lurching out of the closet, I thought the earth would move under my feet. But what I found was that nobody was really interested. And so... after a while... I crept back into the closet & closed the door. I'm still there...