You asked

How many women are there in the UK aged between 45 and 60? How many women are there in England are there aged between 45 and 60?

We said

​Thank you for your request regarding the number of women aged between 45 and 60, both in the UK and in England.

Please see the following published dataset: Estimates of the population for the UK, England and Wales, Scotland, and Northern Ireland. Within this dataset, please navigate to the tab named 'MYE2 – Females'. This provides population estimates for females by single year of age for the United Kingdom (code K02000001) and England (code E92000001) in mid-2019. This is the most up-to-date information we have available. Data for mid-2019 to mid-2020 will be available in June 2021.

Mid-2019 population estimate for women aged 45 to 60 in the UK: 7,244,488

Mid-2019 population estimate for women aged 45 to 60 in England: 6,055,781