This article (or one like it) needs to see wide circulation as a counterpoint to the posted article.
All things being equal and assuming some sort of positive savings rate and return on investment older people will _always_ be richer than younger people.
What's more when your denominator is so small (old / young) the increasing X% just becomes silly. If their average wealth decreases $600 (which is the projected impact of rising gas prices next year, I believe) the elderly will then be 56X as wealthy.
Personally, the fact that the average not-old person is swimming in consumer debt, has a 0% savings rate, and that by their own choosing is the real story and one that no one seems willing to touch.