Memories last forever.
Meaning: This sentence means that the memories of past experiences or events can continue to exist in a person's mind for a very long time, even forever. It's like saying, Remembering past experiences or events can bring them back to mind, even many years later.
Choice of Words: Memories are the mental records of past experiences or events. Last is a verb that means to continue to exist or endure. Forever is an adverb that means for an infinite or unending period of time. When you put them together, "Memories last forever" expresses the idea that the mental records of past experiences or events can continue to exist for an unending period of time.
Alternative Expressions
Related Expressions