Vatican City - Pope Francis urged his followers at his weekly prayer on Wednesday to show affection and respect for the elderly, saying they must not be treated as "aliens".
"It's a mortal sin to discard our elderly," said the pope, seen by his supporters as a champion of the poor and marginalised.
"The elderly are not aliens, we are them, in a short or in a long while; we are inevitably them, although we choose not to think about it," he told 12 000 followers gathered on Saint Peter's Square.