Not everyone will accept bitcoin as their retirement fund, so understanding the volatility, fluctuations and market movements should be fundamental to them.
The current generation will probably choose bitcoin as their retirement asset this can be seen from some interest that is so much, now indeed many people have been literate towards fiat which continues to erode inflation every year, think back to how we started this plan on bitcoin as a pensioner later?
I am planning something similar where I will continue to put a little bit of bitcoin for the old days, this is quite reliable than fiat which continues to decline in value.
At the age of retirement everyone needs a return that is free from volatility since we are not young by that age to invest or earn profits. The reason why bitcoin doesn't fit in retirement savings is its volatile nature and your investment may hang up for an indefinite period of time. At the moment it's best not to risk such critical investment into bitcoin. Better put extra cash into bitcoin in DCA manner.