Ofcom has recently updated some advice under the title ‘Sharing your data online – what you need to know’, first published in July 2019.
It clearly explains what decisions people need to take about their data, and how they can take more control of it.
It also includes some useful links to other sites and services, such as specific age-related help from NSPCC and Age UK.
It’s available on the Ofcom site at https://www.ofcom.org.uk/about-ofcom/latest/features-and-news/sharing-your-data-online