Will the friendship between four-year-old Scarlett and 84-year-old Beryl blossom and grow? Also featuring Sylvia, who is 102 and was born during World War One, and Victor, who is 97.
This time the three-year-olds and the 102-year-olds visit a maze for a memory test. Will 81-year-old Lavinia ever find her way out? And a new friendship blossoms over a plate of chips.
The group face a series of challenges with a tram journey and a trip to the supermarket - will everyone return from the shops in tact? And do chickens have belly buttons?
A fierce rivalry breaks out between 102-year-old Sylvia and 87-year-old Ken as they face-off on opposing teams during sports day
It's the end of the experiment. As kids graduate to big school, it's time for a jive, a waltz, and for the older group to see it their memory, mobility and mood has improved.