Key points are not available for this paper at this time.
Vaino Kannisto, Jens Lauritsen, A. Roger Thatcher, James W. Vaupel, Reductions in Mortality at Advanced Ages: Several Decades of Evidence from 27 Countries, Population and Development Review, Vol. 20, No. 4 (Dec., 1994), pp. 793-810
Kannisto et al. (Thu,) studied this question.