LONGEVITY AND LIFE EXPECTANCY Cesare Marchetti International Institute for Applied Systems Analysis Laxenburg, Austria RR-97-11 September 1997 Reprinted from Technological Forecasting and Social Change, Volume 55, Number 3, July 1997. International Institute for Applied Systems Analysis, Laxenburg, Austria Tel: +43 2236 807 Fax: +43 2236 73148 E-mail:
[email protected] Reseai·ch R e poi-ts , which record research conducted a.t ILA.SA , a.re independently reviewed before publication. Views or opinions expressed herein do not necessarily represent those of the Institute, its Na.tiona.l Member Orga.niza.tions, or other orga.niza.tions supporting the work. Reprinted with permission from Technological Forecasting and Social Change, Volume 55, Number 3, July 1997. Copyright @1997, Elsevier Science Inc. All rights reserved. No pa.rt. of this publica.tion ma.y be reproduced or transmitted in a.ny form or by a.ny means, electronic or mecha.nica.l, including photocopy, recording, or a.ny information storage or retrieval system, without permission in writing from the copyright holder. NORTH-HOLLAND Longevity and Life Expectancy CESARE MARCHETTI ABSTRACT The increase in life expectancy at all ages during the last two centuries is in need of a quantitative model capable of resuming the whole process under a single concept and simple mathematics. The basic hypothesis was that through improved hygiene, medicine, and life-style, the stumbling blocks to the full expression of longevity were progressively removed. The mathematics of learning processes was then applied to the secular evolution of life expectancy at various ages. The hypothesis proved very fertile.