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Durbar Square is the generic name used to describe plazas opposite old royal palaces in Nepal. Before the Unification of Nepal, Nepal consisted of small kingdoms, and Durbar Squares are most prominent remnants of those old kingdoms in Nepal. In particular, three Durbar Squares in the Kathmandu Valley, belonging to the three kingdoms situated there before unification, are most famous: Kathmandu Durbar Square, Patan Durbar Square, and Bhaktapur Durbar Square. All three are UNESCO World Heritage Sites.

Old age consists of ages nearing or surpassing the average life span of human beings, and thus the end of the human life cycle. Euphemisms and terms for old people include seniors (American usage), senior citizens (British and American usage) and the elderly.

Old people have limited regenerative abilities and are more prone to disease, syndromes, and sickness than younger adults. For the biology of ageing, see senescence. The medical study of the aging process is gerontology, and the study of diseases that afflict the elderly is geriatrics.