People with an intellectual disability are now living longer than ever before (O'Leary, Cooper, & Hughes-McCormack, 2018) and this increase in lifespan has resulted in many parents caring for their son/ daughter with an intellectual disability into old age, sometimes even up until their own death (Cairns, Tolson, Brown, & Darbyshire, 2013; Emerson & Hatton, 2008). In the UK, there are approximately 29,000 people with an intellectual disability who live with a family member over the age of 70. The World Health Organisation (2000) identified ageing family carers of people with an intellectual disability as a vulnerable group since they are affected by the ageing process while also fulfilling a caregiving role. Ageing carers of a son/daughter with an intellectual disability are more likely to experience social isolation and financial strain than other types of carers (Argyle, 2001; Black & McKendrick, 2010; McConkey, 2005). These challenges, in combination with a growing cohort of parents caring into old age, have led to an increased interest in the experiences of older parents of a son/ daughter with an intellectual disability. While ageing parents continue to care for their offspring in the face of challenges related to old age, there is evidence that many parents benefit from help, assistance and companionship provided by their son/daughter with an intellectual disability (Gant, 2010). A recent systematic review of literature on the experiences of carers aged 75 years and over reported that some studies suggested caring was potentially less challenging for older carers as they adapt to their role (Greenwood & Smith, 2016). However, given the limited number of studies identified in the review which directly compare