I used the run the national network for (female to male) transsexual men. In 1991, within the space of a few weeks, 2 young 'women'; S & T joined the network. They didn't know each other at all. Research suggests that, of that generation, only 1 in approx 100,000 girls would grow up and decide to undergo gender reassignment to become men.
Both did go ahead and over the next couple of years had gender reassignment treatment.