Let's not forget about one important factor when determining MRA+30 vs. your standard retirement. With MRA+30, you do
not receive COLA adjustments until you turn 62. OPM will even say they can't tell you for certainty which option will be better for you in the long run.
Taking
@Robertb's example above....
Based on $150,000 high 3:
Retired in 2008 at Age 57= $86,700 (with 1.7% MRA+30)
Income at age 62 still = $86,700
Retired in 1999 at Age 48= $58,500
Age 49 Cola = 2.4% = $59,904
Age 50 Cola = 3.5% = $62,000.64
Age 51 Cola = 2.6% = $63,612.66
Age 52 Cola = 1.4% = $64,503.23
Age 53 Cola = 2.1% = $65,857.80
Age 54 Cola = 2.7% = $67,635.96
Age 55 Cola = 4.1% = $70,409.04
Age 56 Cola = 3.3% = $72,732.54
Age 57 Cola = 2.3% = $74,405.38
Age 58 Cola = 5.8% = $78,720.90
Age 59 Cola = 0.0% = $78,720.90
Age 60 Cola = 0.0% = $78,720.90
Age 61 Cola = 3.6% = $81,554.85
Age 62 Cola = 1.7% = $82,941.28
In this example, from 62 onward you're looking at a difference of $3,758.71 per year each year for the rest of your life. Granted, you're subject to COLA variance each year and the potential for a 0% increase, but in the grand scheme of things, MRA+30 isn't as monumental of an increase as it appears on paper.
This example is why I will be retiring the day I'm first eligible. I value those years in my late 40's, early 50's too highly for what could amount to only a modest increase.