LGBTQ+

I'm not sure what your question is ... are you saying how credible should we take a 60 year old man claiming to be a 7 year old girl?

I hope you can see how divorced this is from the context of discussing trans identity, since the man doesn't claim to be a 60 year old woman, but instead believes himself to be a 7 year old girl (assuming he wasn't just joking because he's wearing the outfit for a different reason, like a birthday party).

If he really believes this, it is more likely a result of psychosis than something like gender identity, so it's unrelated to the present topic.

Trans people are not psychotic, their gender identity is not a delusion or the result of a psychiatric condition, it is a developmental neuro-endocrine disorder that results in incongruence between the way the brain develops and the way the rest of the body develops.