What can you do to strengthen your concentration? Turn off the blaring music or change over to some more peaceful of meditative. Switch off the television. Put down the phone and turn on an answering machine if you have one.  Tear yourself away from those addictive computer games. Stop talking about doing things that are unrelated to the task at hand. Adjust your environment to suit your task or move yourself to a setting which will permit you to focus. Collect all the items  and information you need to accomplish your task. Put them together in one place and sort them.

It is never too late to revise your approach to concentration. You can start where you are. Decide if staying where you are in your current circumstances will enable you to move ahead.  If this is not the case, then it's time to take the necessary steps to accomplish more in new ways.