It's just an idiom that means further on in their lives.
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zhfanThen why is "down the line" here?You'll find that there are often a variety of different ways to say the same thing in English.
zhfanI got you, thanks a lot. May I ask you an off-topic question? You wrote: You'll find that there are often a variety of different ways to say the same thing in English. Why did you use are? Why not is? Please, sorry for my curiosity1. In the there-construction the agreement is between the verb and the following noun phrase.
zhfanI've always thought that ...Well, don't think that anymore!
zhfanWould that sound bad if I accidentally said "there is often a variety of ways"?It would sound bad to me! (But they won't put you in grammar prison if you say it. They'll just think you need a little more work polishing your English.)