These days youths are more challenged by the future because making decisions about the future is not easy.
This is grammatically correct but inappropriate.
The countable noun youth tends to have negative connotations, especially when it’s plural or part of the lexical phrase the youth of today:
Youths are troublemakers, at that awkward age between childhood and adulthood when they rebel against authority and indulge in sex, drugs and rock and roll, often with negative consequences. Youths hang around town in gangs and old ladies are afraid of them.
Youths in a residential area
Most of the time in IELTS Task 2 essays you want to maintain a more positive – or at least neutral – attitude to young people, and so it’s probably best to refer to them as exactly that – young people!
Another option for IELTS writing would be:
Clean living young people facing the future
as responsible members of society!
In IELTS Task 2 you also often want to make a prediction about how a situation may affect young people in the future. In this case you are talking about future generations:
Notice that we assume there will be more than one future generation and if we’re generalising then there is no article (the).