Research has demonstrated that learning style preferences and how they are taken into account are closely related to learner achievement and satisfaction. The Learning Style Inventory (LSI) was the first comprehensive approach to the assessment of an individual's learning style in grades 3 through 12. The Productivity Environmental Preference Survey (PEPS) was designed for adults based on the same underlying factors and content analysis as the LSI. The PEPS surveys an individual's preferences in each of 20 different modalities. The modalities can be classified under the headings of environment, emotionality, sociological preferences, and physical needs. A study was conducted to examine changes for a random sample of adults (N=1,475) who had taken the PEPS. Adults selected from the national data base were divided into five age groups (ages 18-24; 25-34; 35-44; 45-54; and 55 and older). The results suggest that significant changes occur in adults in the area of their preferred productivity modality. The greatest differences found were between those in the age group of 18-24 and all of the older groups. In addition, there were several differences that occurred for individuals after the age of 55. Persons responsible for designing the learning and working environments for adults need to take individual differences into account and plan environments that are flexible enough to meet individual preferences for optimum learning and production to occur. (NB)