Yes, Obamacare allows discrimination based on age, just like the GOP bill does.
Nothing magical happens to premiums at age 60, that I'm aware of. Anyone over 50 and then 55 gets hit with triple premiums, based on age alone.
I, BTW, do not have more health problems than a much younger person. I have less. I have no medical condition that requires medical care at all. I have mild arthritis, like most people over 45, but doesn't require medical attention.
"Insurers are set to raise the premiums for plans sold through HealthCare.gov by an average of 22 percent in 2017, the U.S. Department of Health and Human Services said in a report. This is approximately triple the percentage increase from 2015 to 2016, when premiums increased by 7.5 percent." http://abcnews.go.com/Health/health-care-premiums-rising-obamacare/story?id=43047190
2018: "premiums for "silver" plans (the most popular plans) are rising 18% next year, after a 12% increase this year." http://time.com/money/4826591/aca-premiums-cost-2018/
"individual market medical costs increased substantially between 2013 and 2015, up an estimated 69%. Third, 2014 insurer data shows that premiums for individual market Qualified Health Plans (QHPs), ACA-compliant plans certified to be sold on exchanges, were much higher than premiums for individual market non-QHPs, mostly plans in existence before 2014 that did not comply with the ACA." https://www.forbes.com/sites/theapothecary/2016/07/28/overwhelming-evidence-that-obamacare-caused-premiums-to-increase-substantially/#665ff02715be
Add to the skyrocketing costs of premiums the fact that deductibles increased and networks narrowed, and that gives a picture of vastly increased costs, on average.
There are pockets of those who did not experience this high an increase, and those who experienced more.
Cost of premiums refers to the TOTAL cost of premiums, not just the part that the insured pays after a subsidy pays part of it.