From inside an article sharing that most of the Obamacare enrollees are much older than anticipated (age glitches) this jumps out:
[…] A White House official said the Obama administration expects most young, healthy enrollees to wait until the last minute to sign up, citing research showing that pattern when Massachusetts embarked on a similar health overhaul in 2007. People have until Dec. 15 to enroll in coverage starting Jan. 1, with open enrollment for coverage during the year lasting through next March.

In states that are running their own marketplaces and have seen smoother rollouts, officials are now also reporting a similar phenomenon, suggesting the economics of the law play a role, too. In Connecticut and Kentucky, which have enrolled more than 4,000 people each in private health plans so far, the largest segments of enrollees in new commercial health-law plans are over age 55, much older than industry actuaries say they had anticipated. Each state ultimately expects to register several hundred thousand people in their exchanges. (read full article)