Nevertheless, studies indicate that some people are more vulnerable to the effects of stress than others. The very young and the very old, for instance, can be prone to stress-related illness, though stress often goes unnoticed in these age groups. Others at risk include: * Women in general, but particularly working mothers * Less-educated individuals * Divorced or widowed individuals * The unemployed * Isolated individuals * People who are targets of racial or sexual discrimination * City-dwellers.