Here’s the grounded theory study protocol of the ongoing sociological investigation that is part of the SAACY research programme. Our study invites adults aged 50-80 years old with different backgrounds and experiences to take part in interviews and focus groups to explore and discuss what ageing means to them. ‘Older adults’ perspectives, experiences, and expectations of ageing in England: A grounded theory study protocol’ is published in the open access journal Social Science Protocols, hosted by Edinburgh Diamond.