In episode four, A New Hope, we're first introduced to Obi-Wan as "Old Ben," the hermit who lives on Luke's home planet of Tatooine and is always dressed in sand-colored robes. As we see in The Force Awakens, Rey also lives all by herself, only she's on the desert planet of Jakku, where she scavenges and sells old ship parts for food while dressed in calming neutral tones. Their lonely lifestyles mirror each other quite obviously.
If that isn't enough for you, many fans have pointed out how Rey and Obi-Wan's characters are the only "good guys" in the series who have British accents (with the exception of C-3PO, which . . . come on). Since there have been a few English actors in the movies who have disguised their natural accents to speak with an American accent instead, it seems like singling Rey and Obi-Wan out was a conscious choice.
