I am drowning in pronouns here. Can someone help me see the grammar behind the use of the "a los" in the sentence below?
Gracias, Juan, pero cuando una mujer llega a los cuarenta, comienza a tener otros deseos.
Is it required to be grammatically correct? Can we not just say "... cuando una mujer llega cuarenta..."?
I suspect it would be required because I think it is a direct object pronoun (of llega?), but I am struggling to find good resources that help explain the concept.