i remember it was pay out at 65 unless you opt to start at 70. so when did they flip?
No, I don’t think that’s correct.
Previously, if you did nothing (took no action), payouts never started. In fact, if you died, and if your CPF nominated heir(s) also took no action, they could leave your accounts fully in place, and those funds would continue to earn interest.
CPF has changed all those happy rules in stages. Now, if you do nothing, payouts start at age 70 and, when you die, any residual (if any) that your CPF nominated heir(s) inherit will stop earning interest at some point (6 months after you die, as I recall).
There are three remaining exceptions to the age 70 payout start (at least for those born in 1958 and thereafter):
1. If you take no action, and if you are a former citizen or a former PR who has left the immediate region, then your payouts will not start at age 70. Indeed, you are barred from participating in CPF LIFE (if you terminated your status before your payouts started).
2. If you notify CPF that you have an acceptable substitute life annuity and that you wish to opt out of CPF LIFE, and if CPF agrees that your other life annuity is a reasonable and sufficient substitute, then your payouts will not start at age 70.
3. If your Retirement Account balance falls below the minimum for mandatory CPF LIFE participation, and if you take no action, then your payouts will not start at age 70 since you won’t be on CPF LIFE.
In all three of these exceptional cases you’re not on CPF LIFE, so no payouts will start automatically.
In addition, in practice, you could probably ignore CPF’s pleas to provide your bank details so that they can start depositing your CPF LIFE payouts from age 70. But that’d probably only put them off for a few months until they figure out a way to shove the money at you.