hey, somebody say you fail maths. somebody say your 12 years is rubbish. somebody say you must do a spreadsheet as a proof that it is 12 years.
JuniorLion's characterization here is essentially correct.
According to CPF's 2018 estimates, assuming Full Retirement Sum at age 55 and payout start at age 65, the Standard Plan's mean payout would be $1,365 (fixed nominal) and the Escalating Plan's mean starting payout would be $1,060. With its 2% annual increase, the Escalating Plan's nominal payout figure will be lower than the Standard Plan's for 13 years then progressively higher thereafter. Here's the math broken into table form (rounded to the nearest whole dollar, through Year 15, which is well below current life expectancy at age 65):
Year 1: $1,365 / $1,060
Year 2: $1,365 / $1,081
Year 3: $1,365 / $1,103
Year 4: $1,365 / $1,125
Year 5: $1,365 / $1,147
Year 6: $1,365 / $1,170
Year 7: $1,365 / $1,194
Year 8: $1,365 / $1,218
Year 9: $1,365 / $1,242
Year 10: $1,365 / $1,267
Year 11: $1,365 / $1,292
Year 12: $1,365 / $1,318
Year 13: $1,365 / $1,344
Year 14: $1,365 / $1,371
Year 15: $1,365 / $1,399
I don't know if the Escalating Plan adjusts payouts monthly or annually, but if the former the precise crossover point (mean basis) is after 12 years, within the latter half of the 13th year -- after 12-point-something years.
Now let's look at real buying power assuming 2% inflation. The Escalating Plan's real buying power holds steady at $1,060, but let's see what happens to the Standard Plan's real buying power....
Year 1: $1,365 / $1,060
Year 2: $1,338 / $1,060
Year 3: $1,312 / $1,060
Year 4: $1,286 / $1,060
Year 5: $1,261 / $1,060
Year 6: $1,236 / $1,060
Year 7: $1,212 / $1,060
Year 8: $1,188 / $1,060
Year 9: $1,165 / $1,060
Year 10: $1,142 / $1,060
Year 11: $1,120 / $1,060
Year 12: $1,098 / $1,060
Year 13: $1,076 / $1,060
Year 14: $1,055 / $1,060
Year 15: $1,034 / $1,060
....and I'm going to take this one out some more on the Standard Plan's real buying power....
Year 16: $1,014
Year 17: $994
Year 18: $975
Year 19: $956
Year 20: $937
Year 21: $919
Year 22: $901
Year 23: $883
Year 24: $866
Year 25: $849
Year 26: $832
Year 27: $816
Year 28: $800
Year 29: $784
Year 30: $769
Year 31: $754
Year 32: $739
Year 33: $724
Year 34: $710
Year 35: $696
This run of real figures stops just before age 100. Living past 100 is, of course, already possible and (as a reasonable forecast) even more likely 35+ years from now.
As any retiree can tell you who is living on a fixed nominal income as his/her predominant or only source of income, progressively reducing one's lifestyle (food, electricity, medicines, etc.) is painful and difficult. Whack, whack, whack, whack.... the hits keep coming for the rest of your days. This is just not fun.
It's also not fun living solely or predominantly on $1,060/month (2018 dollars), stipulated. (Now how'd you like to live on $937? Or $800? Inflation is real, folks.) Which is why I don't recommend planning to live on $1,060/month, but I (generally) recommend grounding oneself in a real baseline lifetime lifestyle below which you can never fall: Escalating Plan, deferred to age 70, preferably boosted to the ERS. That particular combination maximizes the longevity insurance and inflation fighting (real lifestyle preservation) aspects of CPF LIFE, and that's the highest, best use of CPF LIFE since it's not well optimized for other possible objectives (such as bequests -- all CPF LIFE payout plans end up with zero residual if you simply live long enough).