Historical dynamics of age-related mortality of men and women in Finland, Sweden, Netherlands, Denmark, England, France, Italy, Japan, Norway, Spain, Switzerland, USA is studied. Men's over-mortality is shown to undergo regular changes in the course of time. A common regularity is found in all the studied countries within the last 50 years: a significant increase of men's over-mortality with a following decrease. A slight change of approximation limits while calculating parameters of the Gompertz equation is shown to be able to result in qualitative changes in dynamics of the parameters, and hence has an influence on the Strehler-Mildvan correlation.
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