It all depends on an individual bases, if you had a mobility issues, high blood pressure, and type2 diabetes, it will surely expand your life span.
On the other hand life span is a fate thing that you or anyone for that matter cannot interfere on, all what we can do is enhance our life style and strive for better healthy living and enjoy our life's.
Just picture this, a person had vsg and everything went well, no issues at the hospital what so ever, and in their way back home had a fatal car accident, then is it the vsg contributed to shorting their life span, or its just their fate.