Not the OP, but am in OPERS as well. I believe the situation is this person is not eligible to retire within 5 years and is in a transition group. In my case, I am in Group B (eligible to retire between 5 and 10 years from now). Retiring at 55 with 25 years is a reduced benefit. Under the old system early retirement benefit was reduced by 3%/year. Now it is supposed to an actuarial reduction. I've gone into my account and run the online estimator, and this reduction is now almost 8%/year for my situation. Note that I don't have as many years in, so my full benefit is available at age 66, with reduced benefit available at 60. Before the changes I figured I'd start my benefit at 60, now I'll most likely delay.
Old rules = 85% of full benefit at 60, full benefit at 65.
New rules = about 53% of full benefit at 60, full benefit at 66.
Note that I'm referring to % of benefit, not FAS... The health care change is also significant for me... old rules I would be eligible in a couple of years... new rules adds 10 more, puts me over 65... These changes are very significant for some, (me!), and the only folks grandfathered are those already retired, there can be folks like the OP who had a lot of years, maybe done working, but a substantial reduction is in the works.
Missed being in group A by 2.25 years...