a few years
Lo ha logrado en tan solo unos años.
He has achieved this in just a few years.
Durante unos años, mi padre vino a comer los domingos.
For a few years, my father came to eat on Sundays.
— Las invasiones bárbaras (2003)
Al cabo de unos años, la República China era tan corrupta como el viejo Imperio.
After a few years, the Republic of China was just as corrupt as the old Empire.
— El último emperador (1987)
Unos años más o menos, no cambia nada.
A few years more or less doesn’t change anything.
— Taxi Express (1998)
Solo tiene unos años más que yo.
He/She is only a few years older than me.