The proportion of elderly people in the UK population is increasing due to declining fertility rates and longer life expectancies. By 2028, 20% of the UK population will be elderly. An increasing elderly population could strain younger taxpayers and threaten the sustainability of state pension systems if changes are not made. Different perspectives view the impacts of an aging population differently - feminists note increased caregiving burdens on women, while functionalists see benefits of intergenerational bonding, and Marxists criticize low pensions and benefits as capitalist societies "dumping" the elderly. Variations may also exist by class, gender and ethnicity.