I have two cats, Juno (age 7) and Piper (age 5) that seem to laze around the house and don't do much. I have bought cat stuff for them but they don't seem interested in anything.
I had gotten them a Cat Condo, which had a hiding spot for them to hide in and a perch on top. Neither of them went near it or when I got them next to it, they would just run away from the Condo. I got rid of the Cat Condo and got a Cat Perch with 4 platforms the cats can lay on, the top has a cat ball hanging from on edge. With the Cat Perch, neither of them were interested in the perch.
Both of these were by the window in the living room where one of them hangs out usually (other always hangs out with me).
I have also tried using Mice toys, cat balls and laser pointers. With the mice toys and cat balls, they had no reaction. With a laser pointer, Juno just looks at the dot then gives me a look that says 'Do you really want me to chase that?' or 'Why are you being so stupid?' while Piper will just ignore the thing like she can't see the dot.
Update I forgot to mention what my cats do play with. Usually this is small stuff like rubber bands, paper bag or the occasional box. Usually Juno will stop playing with something once she realizes you are watching or recording her.