Resistors are inert and don't really change over time (they can drift in value from thermal stress, but that's another matter).
Capacitors are a different story. Electrolytic capacitors are the ones to change; film types tend to last a very long time and rarely need to be changed. Electrolytics contain a semi-liquid dielectric compound that dries out over time (used or not) leading to catastrophic failure. Electrolytics tend to be larger in value (over a couple of microfarads); film type caps tend be much smaller in value (under 1 microfarad).
Capacitors are a different story. Electrolytic capacitors are the ones to change; film types tend to last a very long time and rarely need to be changed. Electrolytics contain a semi-liquid dielectric compound that dries out over time (used or not) leading to catastrophic failure. Electrolytics tend to be larger in value (over a couple of microfarads); film type caps tend be much smaller in value (under 1 microfarad).