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. 2014 Aug 20;70(8):944–949. doi: 10.1093/gerona/glu130

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© The Author 2014. Published by Oxford University Press on behalf of The Gerontological Society of America.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 2. — (A) Contour of the life-span density layers of Olympians and supercentenarians. Selected window: X _(Olympians) in [1865;1906] (first year forming a density layer up to the last year of a complete cohort); Y _(Olympians) in [80;123]; and X _{(supercentenarians)} in [1865;1897]; Y _{(supercentenarians)} in [110;123]. (B) Olympians’ densification phenomenon. (C) Supercentenarians’ densification phenomenon. The y-axis in B and C represents the sum of the differences in the Y (life span) direction (Σαj) between the density layers by birth date (see Supplementary Material). Graphs (B) and (C) represent the increase of the density layers with time in the direction of the upper life span values measuring the densification phenomenon.