Japan

For the second part of their adventure the group go East to experience living like Japanese retirees. Miriam Margolyes, Wayne Sleep, Bobby George and Rosemary Shrager travel to Japan, which in 2015 had the second-highest life expectancy in the world - in search of the secrets to longevity.

In the historic city of Kyoto, they move into a homestay with 73 year-old twin sisters, Setsu and Fumie. Struggling with Japanese etiquette, Miriam soon learns that being loud and breaking wind in public doesn't go down well here.

Keen to live like locals the group start their day with an early morning keep fit class, called Radio Taiso. Broadcast nationwide, thousands of elderly residents take part in a free exercise class to keep everything ticking over.

Living a long life isn't just down to keeping fit - retirees in Japan also work well in to their 70s and 80s. Inspired by their hosts, Bobby and Miriam look for work at a job centre specifically geared to finding gainful employment for OAPs. For Bobby, this is the first job interview of his life, and for Miriam, it's a chance to reflect on what she'd still like to achieve. The pair are employed to work in a gift shop, while Rosemary and Wayne get a job in one of the busiest noodle bars in Kyoto.

Another pastime enjoyed by most senior citizens is a long soak in the hot springs dotted around the country. But unlike the spas Miriam and Rosemary are used to back home, this therapeutic remedy is traditionally done naked with everyone else bathing with you. Horrified at the thought, the ladies have to decide just how authentic they want their trip to be.

Inspired by the Japanese attitudes to keeping the body and brain active, eating the right food and finding employment, the group are heading home with lessons learned about how to live out their golden years.