Research into ageing may enable women to remain fertile for longer.And that raises the prospect of havin9 100一yearold parents.or brothers and sisters born 50 years apartl。We think of an eider sibling as someone who can protect us and offer help and advice.That would be hard to do if that sibling caltle from a completely different generation.

　　Working life would also be affected，especially if the retirement age was lifted.More people would stay in work for longer.That would give us the benefits of ageskill，wisdom and good judgement.

　　On the other hand，more people working.for longer would create greater competition for jobs.It would make it more difficult,younger people to find a job.Top posts would be dominated by the same few individuals，making career progress more difficult.And how easily would a 25-year-old employee be able to communicate with a l25-year-old boss?

　　Young people would be a smaller part of a society in which people lived t0 140.It may be that such a society would place less importance on guiding and edncating young people，and more on making life comfortable for the old.

　　And society would teel very different if more of its members were older.There would be more wisdom，but less energy Young people like to move about，old people like to sit still.Young people tend to act without thinkin9.old people

　　tend to think without actin9.Young people are curious and like to experience different things.Old people are less enthusiastic about change.In fact，they are less enthusiastic about everything。

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