Sure. It will no longer be of use to the questioner, of course, but can still be fun for the rest of us.
Is it okay to answer questions from days, weeks, months or years ago? xd
All the questions here are for us to answer .. Not just the recent ones.
There's nothing wrong with it, although the original asker may not see the new answers :)
Yes, most times I don't look at anyone's answers for questions older than 6 months.
For me most don't seem to be relevance for "today".