No Problem Allesandra
When I first came to Trulia in May, I answered a few older questions without realizing they were old (never noticed the date under the question!). Someone pointed that out to me........so now I make sure to check the date before answering.
It's certainly your prerogative to answer any questons you choose to! I , personally, prefer to deal with current questions asked by people who are waiting for an answer.
Have a great day..