When I was in my late teens early twenties, I weighed between 104 and 112. I am 5'5" and I have a very tiny frame. Recently, I have weighed as much as 183. Right now, I am trying to get back down to at least 120. Unless you are large framed at 5'3", I don't see any reason to not try for 105.

Bear- Thank you for this thread, it's been most informative.

Rain