If you accept transgender, then why not trans-aged?

This isn’t farfetched. I’m 42 but most people think I am in my late 20s or early 30s. My athletic performance and capability is that of a much younger person. It’s only declined very marginally since my early 20s. I also tend to get along better with younger people, male or female (though in general I more easily bond with women).

Compared to my peers, I’m much younger physically no matter what my birth certificate says. And as is often pointed out on Clarissa’s blog, once you declare a certain set of properties fluid that used to be fixed, what is the limit to that fluidity? Since the standards are arbitrary and not based in science nor reason, can you draw any boundaries at all?

I think it’d be perfectly reasonable to declare myself 31 instead of my actual age. No one would know the difference. In the age of fluidity, why not?