It is at Helsingborg's city theater that the performance premieres in two weeks.
Helsingborg resident Cecilia Borssén is one of the actors.
Part of the preparation is about making her a 90-year-old.
- I have tried with age apps - but to see it live like this is great fun, she says.
See when Cecilia Borssén wears make-up - and gets 40 years older.