VOA慢速英语:Study: Humans Will Never Live Much Past 115 Years

来源:搜狐教育 2016-10-12 00:57:00

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Anewstudysuggeststheremaybealimittohowlongpeoplecanlive.

Americanresearchersfoundthatthelongestahumanbeingcanliveisabout115years.

TheresearchersarewiththeAlbertEinsteinCollegeofMedicineinNewYorkCity.TheirfindingswerepublishedinthejournalNature.

ThestudywasbasedonmortalityandpopulationrecordsfromtheHumanMortalityDatabase.Thedatabasehasacollectionofrecordsfrommorethan40countriesdatingbackto1900.

Greatstridesinlifeexpectancy

Theresearchersfoundthattheaveragelifeexpectancyhasrisengreatlysincethe19thcentury.Thishasresultedpartlyfromdevelopmentsinmodernmedicine,includingtheuseofvaccines,antibioticdrugsandimprovedtreatmentsforcancerandheartdisease.Inaddition,therehavebeenmanyimprovementsinpublichealthandnutrition.

In1900,someonebornintheUnitedStatescouldexpecttolive47years.Today,Americanscanexpecttolivetoanaverageageof80.

AccordingtotheU.S.CentralIntelligenceAgency,theMediterraneannationofMonacohasthehighestaveragelifeexpectancyintheworld--89.5years.NextareSingaporeandJapan--eachat85years.

TheoldestdocumentedpersontoeverlivewasJeanneCalmentofFrance.Calmentwas122yearsoldwhenshediedin1997.AnItalianwoman,EmmaMorano,iscurrentlyrecognizedastheworld'soldestlivingperson.Sheis116yearsold.

Highestlifespanreachedin'90s

Researchersinthenewstudysaidtheirfindingssuggestthatthegreatestaveragehumanlifespanwasreachedduringthe1990s.TheynotedthatsomeindividualsbornintheU.S.,France,JapanandBritainlivedtobeatleast110yearsoldbetween1968and2006.Butthenumberofpeoplelivingpast110yearsisverysmall,andconsiderednotreachablebymostofthepopulation.

Thestudyfoundthatsurvivalrateshaveimprovedsince1900,withsomeolderadultslivingtoage100andabove.Butthenmanyofthoseindividualsdiedashorttimelater,regardlessofwhentheywereborn.

Theheadofthestudy,JanVijg,isheadofthegeneticsdepartmentatAlbertEinsteinCollegeofMedicine.Hesaidthefindingsshowadecreaseintheabilitytoreducedeathratesamongolderadults.Hesaidthissuggestsapossiblelimittohumanlifespan.

BrandonMilhollandwasaleadscientistonthestudy.Ashenoted,“Itispossiblethatsomeonemightliveslightlylonger,buttheoddsofanybodyintheworldsurvivingto125inanygivenyearislessthanonein10,000.”

JanVijgnotedthatcontinuedmedicaldevelopmentstoimprovethequalityoflife-especiallyinthedevelopedworld-couldpushaveragelifeexpectancybeyond80.Buthesaidresearchersstilldonotexpecttheaveragehumanlifespantoeverbreak100.

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From:http://www.hxen.com/englishlistening/voaenglish/voaspecialenglish/2016-10-11/445998.html

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