Can this generation be saved?

Earlier in the year, the Bible Society reported that a "Quiet Revival" was sweeping the United Kingdom amongst the younger generations. This assertion was recently backed up by secular YouGov polling that discovered belief in God has tripled amongst British 18-24 year olds in the past four years.

This is great news that gives us hope for the future, but the question is, "What about those in their late 30s to 60s? What about the Gen X'ers and the Millennials? Why do they remain stubbornly opposed to God even as their society crumbles? Is it too late for them? Are they a lost generation?" Or...is there still hope that they too can be saved?