I say that levels of obesity at different ages are important where any hormonal imbalances are concerned.
A slow rate of weight gain leading to being moderately overweight or borderline obesity during late middle age really doesn't require any serious metabolic derangement or serious explaining - merely often a gradual decline in activity levels that lead to an accumulation of weight at a snail's pace of a few pounds a year. This actually confers some biological advantages regarding maintaining bone density, chances of surviving a heart attack and longevity.
Whereas central obesity, and obesity in general, in a teenager or young adult are much more cause for concern and likely to indicate serious metabolic and hormonal imbalances.
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.