Untillateinthe20thcentury,mostAmericansspenttimewithpeo...
问题详情：Untillateinthe20thcentury,mostAmericansspenttimewithpeopleofgenerations.Nowmid-agedAmericansmaynotkeepintouchwitholdpeopleuntiltheyareoldthemselves.That’sbecausewegrouppeoplebyage.Weputourthr...