The focus of this chapter is on the sensor within an aging population. The study involves a detailed analysis of applications with sensors and the effects of their use in the basic sectors of society, such as economic, educational, medical, social security system, social, and cultural activities. After a faithful presentation of the notion of sensor, the work makes a foray into contemporary technical history starting with the appearance of sensors, selects and appreciates some characteristic and edifying parameters of daily life from the beginning of the period of using the sensors; these parameters refer to living standards, health standards, mortality rates, life expectancy, birth rate, occupations by sex and age, educational level of individuals, employment, degree of development of a professions, the interest of the population for a certain type of product, and the tendency to use modern equipment by fields of activity by geographical areas.