Absolutely!!!
Bitcoin is one of the best assets one can have in this century. Instead of depending on fiat currency and fixed deposits, why not have Bitcoin, have gold, have a business, and many other assets available.
All these can give high returns in the long run.
Bitcoin is indeed the best among other assets in it class, and for one significant fact fhat Bitcoin have an edge against inflation makes Bitcoin the best possible asset for long term goal such as retirement, and also for the fact that having your retirement funds in Bitcoin keep your asset away from over taxation also contribute to the many success that comes with Bitcoin as retirement savings.
Since retirement has to come with long-term goals, it makes Bitcoin more suitable for that demand since Bitcoin's value and profitability are reflected in the long-term base.
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.
I think it would only be applicable to those people who's already trading or investing in crypto industry for a long time like the current generation as you said. Because not only that they already have the idea but the fact that they are already familiarize and know what to do with Bitcoin. Unlike to those people who will retire and would need to study Bitcoin because why would you choose Bitcoin as your retirement plan if you don't even have any idea about it right? I think if they might not use it as a retirement plan but as an investment instead. Because mostly on retiring people are already at age 60+ (here in my country) so they might not have the time to study and learn Bitcoin.