Move your plant to an area that faces an Eastern-facing window (not directly in front) so it gets indirect morning light without being directly in the sun.
Peace Lilies are tropical plants and therefore need to have higher temperatures in order to remain healthy. Place your plant in a room where you can keep the temperature constantly at above 70 degrees Fahrenheit.
The tropics are places of high humidity and the Peace Lily needs to live in a humid environment in order to thrive and for the plant to flower. Use a small humidifier or humidity tray to improve the humidity.
Once the winter has past you should only fertilize your plant once every 6 weeks, from spring through fall.
Tap water often has fluorine and other chemicals that may be toxic to your plant. The simplest way to avoid using tap water is to buy and use filtered water for your plant.
If your plant comes in a small pot, then transplant your plant once into a pot in the size that will accommodate your plant when it is full-grown.
Following the plants care instructions to the letter and making sure you water your plant at the same time every day can help reduce the stress to the plant and help to keep it healthy.
Peace Lilies do not live forever. Your Peace Lily flower goes through a life cycle. There really isn’t anything you can do to prevent your plant itself from aging. However, with proper care your flower should last for its entire lifespan.