The average life of a vinyl pool liner is seven years. Though some make it 10 years or longer, seven years is the expectation. If you live in a cooler climate where the pool is covered six months of the year, it may last twice as long as one in Texas that is exposed to the sun 12 months out of the year.
You can extend the life of your liner by keeping the PH and chlorine levels in the proper range. However, after seven years of exposure to sunshine and chlorine, it will most likely be time for a new liner.
*Pattern pictured is Logan.