More older Americans than young adults so far have signed up for new insurance coverage under the state marketplaces created by President Barack Obama's healthcare law, according to early data from four states reporting details on their enrollment. Early data from Connecticut, Kentucky, Washington and Maryland show that so far more than 20 percent of the 23,500 combined enrollees in private insurance plans are 18 to 34 years old, ranging from about 19 percent in Kentucky and Connecticut to about 27 percent in Maryland. Additional demographic data is expected from California on Thursday. Health policy experts and actuaries said it was premature to draw any conclusions from the initial demographic data, with one likening it to "trying to call an election when you only have 10 percent of the returns." Still, Steven Schramm, managing director of Optumas, a strategy and actuarial firm that works with state Medicaid programs and exchanges, said 20 percent was surprising at this stage, given that healthcare advocates were expected to target more elderly Americans at first to make sure they got enrolled.