A fair number of people I have spoken to are under the impression that because they did not register a couple of weeks back, they are not eligible to vote!
Quite simply if you registered 20 years ago you are still able to vote. The only curved ball is if you have moved and not advised the system, your voting station may be at your old loc.
Text your ID to 32810 and you will get a quick response on if & where you can vote.