Many people, especially those who grew up before the age of the personal computer, don’t understand how computers store information. indentify the adjectives and the nouns they modify?

Adjectives are words which modify nouns, meaning that they describe them to a greater extent. They are usually located next to each other.
Here, those adjectives are: many (which modifies the noun people), and personal (which modifies the noun computer).
Hope this helps!