EN
Increase in numbers and proportions of the elderly is related to numerous social, political, and economic consequences. As result population ageing could be treated both as a threaten and as a challenge to a society. The attention of the author is focused on arguments used by proponents of the mentioned approaches to the process of population ageing. A crucial argument against the first approach is - according to the author - a hidden and erroneous assumption about invariability when speaking about how age affect the health status and ability and propensity to work.