According to the text, adults over the age of grew up without the Internet, instant messaging, cell phones, MP3 players, tablets, or digital cameras.

Adults over the age of 40.

Explanation:

Adults age 40 lived a life without the internet. Everyone, including Doctors, Engineers, felt life without cell phones, tablets, and digital cameras are different. Many people who lived in the Dark Ages will tell life is less busy, less stressful. People enjoyed each other company. However, today many people feel a good change in life.

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