"In just over half of states, that newly insured [27 year old] will pay between $195 and $250 a month for the second-lowest cost silver plan. In five states, that person will pay more than $320 a month ... This newly insured [50 year old] will pay more for coverage, typically about 70% more than the 27-year-old."
So, sticker shock at both ends. In any case, it's interesting to click around to see the variation in premiums from place to place, and age to age:
[Hat Tip: PwC HRI]