The Canadian Institute of Actuaries just published a paper on the pros and cons of delaying take-up of Canada Pension Plan (CPP) payments. Although the paper is focused on the Canadian system, it might have some relevance to similar decisions made under other countries' regimes.
https://www.cia-ica.ca/docs/default-source/research/2020/rp220114e.pdf
The key finding (supported by a lot of math - these are actuaries after all) is this:
"For retired Canadians with sufficient bridging funds in their RRSP/RRIF savings that they intend to use towards increasing their lifelong annual retirement consumption, the financial trade-offs underlying the decision to delay CPP payments depend on mortality and financial market returns. In other words, from a cashflow and savings perspective, the CPP timing decision is unaffected by those considerations that are normally key to retirement financial planning – such as Guaranteed Income Supplement (GIS) benefits, taxes, pension income, other savings, or even the level of the CPP benefit itself. Mortality expectations and financial market returns are the only direct factors affecting the financial trade-offs in terms of cashflow and savings."
https://www.cia-ica.ca/docs/default-source/research/2020/rp220114e.pdf
The key finding (supported by a lot of math - these are actuaries after all) is this:
"For retired Canadians with sufficient bridging funds in their RRSP/RRIF savings that they intend to use towards increasing their lifelong annual retirement consumption, the financial trade-offs underlying the decision to delay CPP payments depend on mortality and financial market returns. In other words, from a cashflow and savings perspective, the CPP timing decision is unaffected by those considerations that are normally key to retirement financial planning – such as Guaranteed Income Supplement (GIS) benefits, taxes, pension income, other savings, or even the level of the CPP benefit itself. Mortality expectations and financial market returns are the only direct factors affecting the financial trade-offs in terms of cashflow and savings."