This is the 3693rd most frequent Spanish word.
pasados
"Pasados" means "past" or "expired" in English, depending on context.
Here, 'pasados' signifies time that has already elapsed, modifying 'años' to denote they occurred in the past.
En los últimos años pasados, muchas cosas han cambiado.
In the past years, many things have changed.
In this sentence, 'pasados' qualifies 'eventos' to indicate they took place earlier, showing a relation to previous occurrences.
Recordamos los eventos pasados con nostalgia.
We remember past events with nostalgia.
Use of 'pasados' here emphasizes the past timeframe for the 'años', indicating experiences from elapsed time periods.