Mr Red
Its very hard to motivate a person of 90 if they don't want to be motivated.
I have the same problem with my mother who is 90. I have tried all sorts of things and non of them have worked.
The only thing I have managed to achieve, is getting a radio/casstte/CD playerand she uses it and listens to Radio Lincolnshire only if the staff at the nursing home or visitors put the headphones on. At the same time, i bought a large screen TV with DVD and Video for her bedroom. Again that works if the Staff put things on for her.
What she likes more than anything is her family visiting her and being taken out for a roll in her wheelchair.
Other than that she just seems contented to let the world go by.
Its very upsetting to see it happening, but I reckon I have achieved all I am going to with her.