text_1: 7-day-old adult Caenorhabditis elegans exhibit approximately 5% of the learning capacity seen in 1-day old adults.
text_2: Here we show that the C. elegans Insulin/IGF-1 receptor mutant daf-2 improves memory performance early in adulthood and maintains learning ability better with age but, surprisingly, demonstrates no extension in long-term memory with age.