根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
AreSocietiesAgeingTooFast?
Anageingsocietyisoneinwhichthepopulationofpeopleovertheageof60isincreasing．Theglobalpopulationatpresentisabout6billionwith1personinevery10aged60orabove．小题1:_．Thiswillmeanthatforthefirsttimeinhumanhistorythepopulationofolderpersonswillbelargerthanthepopulationofchildren!Whatarethecausesofthispopulationchange?
小题2:_．Andanotheristhatbirthrateshavedroppedaspeople,especiallywomen,areeducated．MeasurestoslowpopulationgrowthlikeChina’sone-childpolicy,havealsocontributedtoloweredbirthrates．Theincreaseintheagedpopulationisnotjustaninterestingtrend,however;italsohassevereimplicationsforthefutureofglobaleconomies．
Peopletraditionallyretireat65andliveongovernmentpensions．小题3:_．Anotherconcernisthatasmedicalexpensesincreasewithage,thedemandsofthegrowingagedpopulationwilleventuallycausemedicalsystemstofacebankruptcy（破产）．
_小题4:__．Theysuggestthatbecausepeoplearelivinglonger,theyoughttoworklonger,whilegovernmentsneedtoestablishasoundsocialsecuritysystem．Theyalsosuggestthatindividualsstartsavingassoonaspossibletoensureafinanciallysecureretirement．Peopleshouldalsodevelopgoodhealthhabitsintheiryouthtoensureanactiveandproductiveoldage．小题5:__．ByfindingcuresfordiseaseslikeAlzheimer’sandcancer,medicalbillsandtheneedforcarewouldbedrasticallyreduced．
Finally,animportantsteptoensureabrightfutureforallistodoawaywithnegativestereotypesthatseevaluablemembersofsocietyonlyaspensionersorpatients．It’shightimewestoppedseeingageingasadiseaseandstartedplayingourpartsinsecuringthefutureofourageingsocieties．