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Melvyn Bragg and guests discuss ageing. In 1900, 1% of the world鈥檚 population were over 65. In the 1990s nearly 8% are. By the year 2020, nearly 1/5th of the world鈥檚 population will be over 65 - the figure rises to 25% in the UK. We are now living longer than at any time in our history. How much do economic factors, rather than biological factors, determine what ageing really means and our attitude to it? And what are the ethical, economic and biological implications of living longer?Tom Kirkwood, is an expert on the science of ageing and he brings to bear a close study of how the ageing process is being arrested and speculates on the very great age some of us could and will reach. He has said: 鈥淭oday鈥檚 older people are the vanguard of an extraordinary revolution in longevity that is radically changing the structure of society and altering our perceptions of life and death. The price for this success - and make no mistake it is a success - is that we now face the challenge of ageing.鈥滱lan Walker is an expert in the sociology of ageing and he takes in the whole context, especially the economic dimension. With Professor Alan Walker, social gerontologist, advisor to the UN鈥檚 programme on Ageing and has chaired the European Commission鈥檚 observatory on Ageing and Older People; Professor Tom Kirkwood, Britain鈥檚 first professor of Biological Gerontology, University of Manchester and President of the British Society for Research into Ageing.