This volume documents a radical change in the experience of aging. Based on two ethnographies in Dublin, Ireland, the book illustrates how smartphones enable old people to focus on crafting a new life in retirement. For some, the smartphone is an intimidating burden linked to being on the wrong side of a new digital divide. But for most, however, it has become integral to a new trajectory towards a more sustainable life, both for themselves and their environment. The smartphone has reunited extended family and old friends, helped resolve intergenerational conflicts though new forms of grandparenting, and has become a health resource. This is a book about acknowledging late middle age in contemporary Ireland and examines how older people in Ireland experience life today.