You can go back further but it's kind of a pain to do it.
Under recent activities, go to more activities, click on the oldest date to bring up only that day. Then on top left click on previous day, then click on recent activities and it will bring up the next older dates. Keep repeating it to get back to the oldest date you are looking for.
BUT you have to do it in reverse to get back to the current date OR I just click on forums, then click back to activities and it brings me back to the current date.
"Just Do It"