Girls do perform better overall at A Levels and more girls are going to university, but in the subjects that deliver the best paying careers, they are in a minority.
There is much research to show that it is a lot more complex than 'they are not interested'. At the age of 5, girls believe that they are as good as boys at Maths, by the age of 8, they no longer believe this.
At Secondary school, the number of girls taking physics and higher level maths is significantly fewer than the number of boys taking those subjects. Classroom behaviours and social pressures from all angles are responsible for this.
Things have not advanced significantly since the 1990's. Women are still in a minority at board level and women are still paid less than men, not only are they paid less for the same jobs though this gap is narrowing, they are also less represented in the higher paid jobs.
I did Engineering at University, when interviewing for jobs, I had one interviewer ask me if I wouldn't prefer to go into International Commercial Management instead as I could also speak fluent technical French. At another interview, I was the best candidate in the field (they told me) and despite expressing a strong desire to have a job in Manufacturing Management, the Male Purchasing Director pulled ran on the Female Manufacturing Manager and offered me an office based role in Purchasing. I asked them if they would reconsider as I would decline the purchasing role but would accept a manufacturing role as that is what I wanted to do, they would not change their mind. I can remember having to explain myself again and again as to why I wanted to do Engineering and not--- whatever alternative was deemed more suitable. My male colleagues were never asked to justify their choice of career.