Week three of the experiment are Lark Hill retirement home is all about memory, finding out whether the classmates can all remember one another's name well enough to write them out on the blackboard. They also visit a local maze, which is then re-created to scale on the nursery floor and everyone has to try to recall the way out. Meanwhile new friendships start to blossom, as four-year-old Lily persuades 87-year-old Ken to swap his chips for her vegetables, while he bonds with 84-year-old Fred.