. 2018 Dec 18;8(Suppl 1):S3–S8. doi: 10.3233/JPD-181474
© 2018 – IOS Press and the authors. All rights reserved
This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial (CC BY-NC 4.0) License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Fig.1.
World population 65 and older, 1990– 2040 [33, 34].