These are the criteria for childhood gender dysphoria in the DSM-5:
A strong desire to be of the other gender or an insistence that one is the other gender (or some alternative gender different from one’s assigned gender)
In boys (assigned gender), a strong preference for cross-dressing or simulating female attire; or in girls (assigned gender), a strong preference for wearing only typical masculine clothing and a strong resistance to the wearing of typical feminine clothing
A strong preference for cross-gender roles in make-believe play or fantasy play
A strong preference for the toys, games or activities stereotypically used or engaged in by the other gender
A strong preference for playmates of the other gender
In boys (assigned gender), a strong rejection of typically masculine toys, games, and activities and a strong avoidance of rough-and-tumble play; or in girls (assigned gender), a strong rejection of typically feminine toys, games, and activities
A strong dislike of one’s sexual anatomy
A strong desire for the physical sex characteristics that match one’s experienced gender
And for adults:
A marked incongruence between one’s experienced/expressed gender and primary and/or secondary sex characteristics (or in young adolescents, the anticipated secondary sex characteristics)
A strong desire to be rid of one’s primary and/or secondary sex characteristics because of a marked incongruence with one’s experienced/expressed gender (or in young adolescents, a desire to prevent the development of the anticipated secondary sex characteristics)
A strong desire for the primary and/or secondary sex characteristics of the other gender
A strong desire to be of the other gender (or some alternative gender different from one’s assigned gender)
A strong desire to be treated as the other gender (or some alternative gender different from one’s assigned gender)
A strong conviction that one has the typical feelings and reactions of the other gender (or some alternative gender different from one’s assigned gender)
So in answer to the OPs questions.
- Do you think you meet these criteria currently?
This obviously refers to adult criteria. Answer: No, but it does depend what is meant by 'expressed gender'. Does that mean things like being in a male-dominated profession or having male-dominated leisure interests, or sometimes buying clothes from the men's department? In which case it could be a partial 'yes'.
- Do you believe that you used to?
As far as the children criteria go, yes to most of those about stereotypes (that is all except the first and the last two). But when I was a child, it was perfectly normal to play with all sorts of toys and have a mixed sex group of friends. Clothes (other than school clothes and for formal occasions) were typically trousers or shorts for practicality when playing outdoors.
- If so, how long ago, roughly, was this?
60s and 70s
- If so, did you pursue treatment of any kind?
What for?
- If not, do you think you would have sought a referral to GIDS or GIC, had it been an available option you were aware of? Do you think you would you have desisted?
No, but if this gender stuff had been around then I'd probably have identified as non-binary if the alternative was being put in a frilly pink girly gender box. I didn't want to be a boy. I knew that the only reason why I was sometimes prevented from doing what I wanted to was because of the sexist dinosaurs who were in charge, who I thought at the time were on their way out. How wrong I was.
- What is your general experience of the concept of gender, in whatever way you would choose to define it
It's the social and cultural expectations which are placed on people because of their sex. It's oppressive and regressive.