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An aging population refers to a phenomenon in which the median age of the population in a region or country rises significantly when compared to the total population. This is caused by a declining birth rate or rising life expectancy.


According to Marketing Charts, the 18- to 44-year-old age group uses the Internet the most, boasting more than half of the United States' online population. Email is the most popular online activity, surpassing instant messaging, social networking and blogging.


Charts for age, height and weight are used to provide a rough reference to determine how a child or teenager is developing, specifically whether he is underweight or overweight. Height/weight charts can be found online, or a doctor can consult one to provide a professional opinion.


To convert a cat's actual age to his comparable age in human terms, allow 15 years for the first year of life, add nine for the second year, and add four more for each subsequent year. For example, a 5-year-old cat is approximately equal to a 36-year-old human.


A baby can start using a walker between the ages of 6 and 12 months. A baby walker is a device designed with wheels to help babies with mobility.


The required age for children to use a booster seat in a car varies by state, according to the Governors Highway Safety Association. Booster seat requirements are generally based on age as well as weight and height, although some states have laws based on just one of these variables.


The age specifications for using an Advair inhaler vary depending on the type, according to Drugs.com. Advair HFA is for adults and children age 12 and older, and Advair Diskus is for adults and children age 4 and older.


Radioactive dating uses the decay rates of radioactive substances to measure absolute ages of rocks, minerals and carbon-based substances, according to How Stuff Works. Scientists know how quickly radioactive isotopes decay into other elements over thousands, millions and even billions of years. Sci


KidBiz3000 is designed for students in second grade through fifth grade. The program is followed by the TeenBiz3000 and Empower3000 programs, which are designed to be used by students through grade 12.


A new index ranks the best nations for senior citizens. The United States does pretty well, but experts say a lot more needs to be done to avoid a crisis. A new index ranks the best nations for senior citizens. The United States does pretty well, but experts say a lot more needs to be done to avoid