When planning for retirement, remember it is key to understand that difference between factoring standard inflation (the cost / purchasing power that is lost over time) and the cost of living that is specific to you.  One of the key components to planning for a retirement that will last, is to understand what your standard of living will cost in the future and to plan accordingly with a sustainable investment design:

https://www.nj.com/business/2017/03/growing_poorer_inflation_vs_cost-of-living_biz_bra.html