We are getting off topic.
Anna, if you are particularly interested in the topic of what I would call "differences in sex development," (DSD) maybe you should start a new thread (because we don't have enough threads on emotional, controversial topics
).
In any case, I will briefly answer your questions here and then return to the topic of the thread.
Where do intersex people fit in if they have characteristics of both those "only 2 sexes" speak of, or different chromosomes than XX or XY?
Not all women have ovaries.
Not all women with ovaries produce, store or release eggs, menstruate or can get pregnant.
To quote a new Supreme Court justice, "I'm not a biologist"
(or a medical doctor). So I won't attempt to give well-informed responses to your points.
However, I will acknowledge that a very small number of humans (less than 1%) are born with abnormalities in their chromosomes (something other than the normal XX or XY) that result in various differences in sex development, in other words, differences from the normal pattern of development of male and female gonads (testis or ovary).
Claire Graham is a woman born with a certain DSD and she has written and talked about DSD a lot.
She does a good job of explaining what DSD is and what it is not.
..It is not a spectrum, although I know that’s a popular theory. There are only two sexes in humans. As I say, sex is the language we use to describe reproduction. People have potential to be either large gamete producers, or small gamete producers. No one produces both; no one produces something else.
Some people are infertile, but that doesn’t make them sexless. Doctors can tell what sex infertile people are, hence, we have different treatment options for males and females to help with fertility problems. To be slightly explicit, doctors do not look at the testicles of an infertile male and wonder if they should be producing sperm or ova...
Interestingly enough, this portion of your definition indicates you have the same definition as radical feminsts. lol
I agree with traditional feminists on a few things. On the topic of DSD and its implications, I agree with traditional feminists-- sex is not a spectrum. There are only two sexes and the existence of DSDs does not negate that fact.
Now to return to the topic of the thread, I don't consider age to be an important criterion in choosing an escort (assuming we are talking only about women of legal age, 18+).
I have had sexual encounters with escorts as young as 18 (at least advertised as "18") and as old as 40+. I rarely even pay much attention to age, though I will acknowledge that age can be a factor in how an encounter proceeds. I am much more concerned with physical characteristics that I tend to like, reviews, photos and my gut feeling about the mix of those characteristics in a particular girl. It's possible to have a good or bad experience with a woman of 18, 28, 38, 48 or beyond.