Ask Science Fiction

All 3 of them lived in a time when places like Illum weren’t available for finding a crystal for their lightsabers. Luke lived when the empire was using kyber to power the Death Star, whilst Leia was trained shortly after the Empire was destroyed, as implied by a flashback from the ST, and for Rey Illum was transformed into Starkiller base and destroyed by the time she had her own lightsaber.