Headscratchers / Myriad Colors Phantom World

• It's stated that the Mass Super-Empowering Event that caused babies to start being born with powers happened 10 years before the events of the series. However, the main characters are older than 10. How can they have powers?
  • Maybe it also affects children.
  • It's likely that during the event the substance that caused phantoms to be seen eventually became part of the atmosphere and simply breathing the affected air caused everyone to see them, but those directly within the area of blast radius or breathed it in second-hand from those who still had their clothes gassed with the stuff gained a phantom trait that manifested as powers. It just wasn't until newborns showed signs of powers that people realized this and that it was genetic, and once it was known other children and adults were checked and many including the main cast were found to have powers, or in Koito's case eventually awaken them on their own.