What gender a person asigns to itself, that depends on a load of genetic, epigenetic, hormonal and neuronal factors.

For example, IIRC male homosexuality is determined by a random epigenetic condition that either occurs or not.
And there seem to be several independent biochemical origins for female homosexuality. (Born lesbian vs "late-blooming lesbian&quot

Gender is really complicated.



Age, on the other hand, can be defined quantitatively by the length of the telomers in your DNA. (They get shorter over time. )

Changing his gender doesn't change when he was born.

and they won't run away.

He'd be the bigly'est handsomest guy in the McDonald's line.

He's the president. He can change it if he wants. He has two months to do it in.