Could it potentially be about perhaps regrets in life. That is go back in time (30 years ago) and make the most of your life (or at least avoid those regrets).
I get the impression that the time travel is to ensure that they make the most of their lives (perhaps feel that they wasted years, or didn't enjoy their youth) ... maybe something in their past made them grow up too quick.
Could it potentially be about perhaps regrets in life. That is go back in time (30 years ago) and make the most of your life (or at least avoid those regrets).
I get the impression that the time travel is to ensure that they make the most of their lives (perhaps feel that they wasted years, or didn't enjoy their youth) ... maybe something in their past made them grow up too quick.