How often do you buy new make-up?

When I run out. I've never done that 3 month rule, and never had any problems, but everyone is different.How often do you buy new make-up?
Once my others run out. If it gets over a year then I buy more.How often do you buy new make-up?
, i buy play make-up when i run out, or when it gets all gooppy and nasty