In order to understand how our attitudes to sensitive personal data changes over time we are exploring the use of personal data archives to support memory cuing in dementia sufferers. In particular, we are looking at how personal photographs can be used to trigger memories and the extent to which such photos can be shared by being displayed in semi-public spaces. This work spans our twin themes of public presentation of information and the use of pervasive data capture for health purposes. This use of pervasive data is particularly interesting because it requires speculative data capture many years ahead of its intended use coupled with a set of beneficiaries who are unlikely to be able to offer informed consent at the point of use.