Different films have different life expectancies and life expectancy is dependent upon multiple variables (climate, exposure to sun, film, installation location, etc).

Insulating / Sun Control Window Films
Interior-applied insulating and sun control window films last longer than exterior-applied films as they are not subject to the elements. Non-metallized films also last longer than metallized films as metal tends to break down over time. However, it is not uncommon for a metallized interior-applied film to last 25 years or more. An exterior-applied metallized film has a life expectancy of up to three years while a non-metallized film has a life expectancy of up to 10.

Security Window Films
Interior-applied security window films last longer than exterior-applied films as they are not subject to the elements. Clear security films last longer than tinted security films. Non-metallized tinted security films last longer than metallized security films as metal tends to break down over time. However, it is not uncommon for a metallized interior-applied film to last 25 years or more. An exterior-applied clear security film has a life expectancy of up to eight years.

Glass Finishes
Interior-applied glass finishes can last 25 years or more.

The video goes into further detail on how 3M tests the life expectancy of its window films.