Studies on the prospective memory performance of adults suggest that in everyday tasks like sending postcards at appointed times there is no age deficit for older subjects compared to younger adults. In contrast, laboratory prospective memory tasks often find age deficits. In a study with young and old adults we tested the hypothesis of older people being better in prospective memory performance in a number of different prospective memory tasks. We also related the performances in everyday and laboratory prospective memory tasks. In addition, we compared performances with respect to the amount of cognitive resources demanded by the different prospective memory tasks. Our results suggest that age deficits in prospective memory tasks are more likely the more laboratory-like a task is, that there is no simple relationship between performances in everyday and laboratory tasks, and that older adults are particularly handicapped when a prospective memory task makes high monitoring demands.