How long can you store propane tanks used for gas grills I have a tank that i bought 7 years ago and used it once. is it still ok to use.?

Propane tanks can be stored indefinitely as long as they are properly maintained and not damaged. However, it's important to check the tank for any signs of rust, dents, or leaks before use. Additionally, tanks should be inspected and requalified every 10 years; your tank, being 7 years old, may still be safe, but it's best to have it inspected before using it again. Always follow local regulations and safety guidelines regarding propane storage and usage.