Snowden was more than a decade ago. The NSA was recording everything.
A few decades ago implies 1990s or early 2000s. In 1990 he was 7 years old. In early 2000 - 17 years old.
a few
a small number of units or individuals
A few decades ago implies 1990s or early 2000s. In 1990 he was 7 years old. In early 2000 - 17 years old.
a few
a small number of units or individuals