EDS cannot be conclusively diagnosed or ruled out from a genetic test for the known collagen or tenascin genetic abnormalities that cause it. In some cases a positive diagnosis can be made, so it's probably worth having the tests done.
You can determine whether you have joint hypermobility by assessing your Beighton score:
The Beighton modification of the Carter and Wilkinson Scoring System - The Hypermobility Syndrome Association
A score of 4 or more makes you hypermobile.
You may not have Erhlers Danlos though, or Marfan syndrome which is another commonly associated syndrome.
I don't have a good fit for any of the defined types of Erhlers Danlos but I do have various symptoms that align with different well-defined types. As do close family members, e.g. glaucoma which is associated with collagen disorder. Plus I have a hypermobile tongue, extremely bendy ears, an overcrowded lower jaw and susceptibility to gum disease that are associated with the syndrome. Diagnosis of this multi-factorial syndrome is clearly still very much in its infancy and more research is needed in defining different types.
I didn't start experiencing any serious joint pains until my late twenties. Other symptoms started when I was a child though, such as inability to hold a pen or cutlery properly, generalised muscle fatigue and weakness, and interstitial cystitis.
I've also had a few acute attacks of costochondritis during the past 5 years where I found breathing very difficult for a couple of days.