BUENOS AIRES — What kind of friendship do people most talk about? Most often it is childhood or teenage friendships, while friendships between men and women are repeatedly analyzed. What about friendships among the elderly? How are they affected when friends disappear, at a stage when grieving is already more frequent?

Argentines Laura Belli and Danila Suárez Tomé, two friends with PhDs in philosophy, explore the challenges and benefits of friendship in their book Filosofía de la amistad (Friendship Philosophy).

They consider how friendships can emerge later in life, in profoundly altered circumstances from those of our youth, with people living through events like retirement, widowhood, reduced autonomy or to a greater or lesser degree, personal deterioration. All these can affect older people's ability to form and keep friendships, even if changes happen at any stage in life.

Filosofía de la amistadexplores the place of friendships amid daunting changes. These are not just the result of ageing itself but also of how one is perceived, nor will they affect everyone exactly the same way. Aging has firstly become a far more diverse experience, with increasing lifespans and better healthcare everywhere, and despite an inevitable restriction in life opportunities, a good many seniors enjoy far greater freedom and life choices than before.