Life expectancy at middle ages has expanded quite a bit:<p><a href="http:&#x2F;&#x2F;www.infoplease.com&#x2F;ipa&#x2F;A0005140.html" rel="nofollow">http:&#x2F;&#x2F;www.infoplease.com&#x2F;ipa&#x2F;A0005140.html</a><p>A 20 year old can expect to live well into their 70s rather than just reaching 60 (so an expectancy of ~55 years compared to 40 years).<p>But sure, the gains are mostly from early survival rates.