I do think that you are perhaps missing the trend that indicates that actually, the opinions of the age group you are referring to is also now changing with greater knowledge of what the issues are and how negatively female people are being impacted.
Here are two data sets asking the same question and it is broken down by age group for the UK. There is a stark difference between the answers from 2018 and 2024. I expect that the next tracker poll that YouGov will do, will show a significant change again in the direction of that acceptance that you are relying on from that age group.
https://d3nkl3psvxxpe9.cloudfront.net/documents/Transgenderdata2018.pdf
https://ygo-assets-websites-editorial-emea.yougov.net/documents/YouGov-Transgenderstudy2024.pdf
For instance just for the 18-24 age group:
Do you think transgender women should or should not be allowed to…
Take part in women's sporting events?2018 in italics, 2024 bold
Should be allowed 39 31% 2018 - 2024 this is decrease by 8%
Should not be allowed 37 53% 2018 - 2024 this is increase by 16%
Don't know 25 15%. 2018 - 2024 this is decrease by 10%
Use women's changing rooms? 2018 in italics, 2024 bold
Should be allowed 61 42%. 2018 - 2024* this is decrease by 19%
Should not be allowed 21 40%. 2018 - 2024 this is increase by 19%
Don't know 18 18%. 2018 - 2024 *no change %
Use women's toilets? 2018 in brackets vs 2024 bold
Should be allowed 66 47%. 2018 - 2024 this is decrease by 19%
Should not be allowed 18 39%. 2018 - 2024* *this is increase by 21%
Don't know 16 14%. 2018 - 2024 this is decrease by 2%
Use women's refuges? 2018 in brackets vs 2024 bold
Should be allowed 69 55%. 2018 - 2024 this is decrease by 14%
Should not be allowed 15 31%. 2018 - 2024 this is increase by 16%
Don't know 16 14%. 2018 - 2024 this is decrease by 2%
I really don't think that you are up to date with the general opinion of young people. I think those trends will be going the same direction with the next YouGov polling for this specific tracker, because we have seen it already with other organisations who have commissioned the same questions being asked by other professional polling organisations recently.
Here is one
https://sex-matters.org/wp-content/uploads/2026/03/Omni-Sex-Matters-polling-March-2026.pdf
The majority of 18-24 year olds don't believe that a person with a gender identity should use a single sex provision that is not for their sex but should either use a mixed sex provision or the single sex provision for their birth sex.
And for each question about whether they, personally, would prefer a mixed sex solution or a single sex provision just for their sex - every question that age group answered with a majority saying 'single sex'.
Anyone believing that young people are not in majority agreement with the much older generations when the discussion around single sex provisions is directly and specifically asked would be mistaken.