Lack of understanding develops between people of widely different age groups, particularly between children (usually from the age of adolescence) and parents, grandparents etc. This lack of understanding may lead to the rejection of the children by the parents or, at a later stage when the parents are in need, the rejection of the parents by the children. It may lead to: family breakdown; juvenile delinquency; hooliganism and assault on older people by youth gangs; destruction of property; student unrest. Equally it may lead, because of fear and prejudice, to rejection of new ideas by older people and resistance to change. On the other hand, the abilities of youth may be overvalued in comparison with those of older people, leading to early retirement, unemployment and neglect of middle-aged and older persons.