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1、DelayedDevelopment:20-SomethingsBlameTheBrain青春因何迷茫？Manyparentsof20-somethingsworrythattheiroffspringhaven'tyetfoundacareerpath,gottenmarriedorbecomefinanciallyindependent.Theseparentsshouldchillout,expertssay.Recentresearchintohowthebraindevelopssuggeststhatpeoplearebetterequippedtomakemajorlifede
2、cisionsintheirlate20sthanearlierinthedecade.Thebrain,oncethoughttobefullygrownafterpuberty,isstillevolvingintoitsadultshapewellintoaperson'sthirddecade,pruningawayunusedconnectionsandstrengtheningthosethatremain,scientistssay.'Untilveryrecently,wehadtomakesomeprettyimportantlifedecisionsabouteducat
3、ionandcareerpaths,whotomarryandwhethertogointothemilitaryatatimewhenpartsofourbrainsweren'toptimalyet,'saysneuroscientistJayGieddattheNationalInstituteofMentalHealth,whosebrain-imagingstudiesofthousandsofyoungpeoplehaveyieldedmanyofthenewinsights.Postponingthosedecisionsmakessensebiologically,hesay
4、s.'It'sagoodthingthatthe20sarebecomingatimeforself-discovery.'Suchfindingsarepartofanewwaveofresearchinto'emergingadulthood,'theyearsroughlyfrom18to29,whichpsychologists,sociologistsandneuroscientistsincreasinglyseeasadistinctlifestage.Thegapbetweenadolescenceandfulladulthoodisbecomingeverwiderasmo
5、reyoungpeoplewillinglyorbecauseofeconomicnecessityprolongtheireducationandpostponetraditionaladultresponsibilities.Asrecentlyasthe1960s,theaverageageoffirstmarriageforwomenintheU.S.was20,andmen22.Today,theaverageis26forwomenand28formen.'Itshouldbereassuringforparentstoknowthatit'sverytypicalinthe20
6、snottoknowwhatyou'regoingtodoandchangeyourmindandseemveryunstableinyourlife.It'sthenorm,'saysJeffreyJ.Arnett,aprofessorofpsychologyatClarkUniversityinWorcester,Mass.,whocoinedtheterm'emergingadulthood'in2000.Foryoungadults,itcanbeastressfultime.Highratesofanxiety,depression,motor-vehicleaccidentsan
7、dalcoholuseareattheirpeakfrom18to25,trendsthattendtoleveloutbyage28,studiesshow.AndarecentsurveybyClarkUniversity,whichpolledmorethan1,000youngadultsnationwide,foundthat72%saidthistimeoflifewasstressfuland3
