Following up on my comment to Scott's comment to the preceding post, here is a webpage with weight charts. Another chart is here on the Weight Watcher's website.
I am a medium framed male, about 5' 9", and for a few more days I'll be 60 years of age. My range on the chart to which I first link is 148-160. On the WW chart it is 135 to 169. (Today at the Weight Watchers meeting I weighed in at 159, seeking 155 as my target weight.) Those are pretty broad ranges. I am sure that in an individual case one would want to move carefully as he or she approached the limits. But they are instructive.