As individuals grow older, they usually require assistance with the daily tasks of self-care. This type of assistance, ancillary care, is essential to maintaining the health of those who need these services. In his prudential lifespan account, Norman Daniels includes access to such services making his account an attractive proposal given the current demographic shift. In this paper, I examine the prudential lifespan account through the lens of old age and I focus on the two concepts on which the lifespan (...) account relies. I show that these two concepts, normal species functioning and opportunity cannot buttress Daniels’s lifespan account; at least it cannot do so for older persons. The tensions that I identify in the prudential lifespan account in relation to aging are instructive for the more recent proposals to include aging in a theory of health and health justice. In addition, my analysis allows me to demonstrate that Daniels’s view of opportunity is irreconcilable to capabilities, the latter being more adaptable to the realities of aging. If capabilities appear more promising, it is nonetheless imperative that the specificities of extended care, such as the need for unpaid caregiving, be taken into consideration. (shrink)