How to Say "decades" in Spanish
The Spanish word for “decades” is “décadas” — A2 level. This is a very common word in everyday Spanish.

Examples
Han pasado varias décadas desde que se construyó este edificio.
Several decades have passed since this building was constructed.
Las modas de las décadas de los 80 y 90 están volviendo.
Fashions from the 80s and 90s decades are coming back.
La empresa ha operado con éxito durante más de tres décadas.
The company has operated successfully for more than three decades.
Feminine Plural
Since 'década' is a feminine noun, its plural form 'décadas' must always be accompanied by feminine plural words, like the article 'las' or adjectives like 'muchas'.
Using the wrong article
Mistake: “Los décadas”
Correction: Las décadas. Remember that time periods ending in -a are usually feminine in Spanish.
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