Balance sheets belong to the world of finance and accounting. They have a column for assets and a column for liabilities. What has this got to do with retirement you are thinking.
There are many ways to construct a parallel:
The assets are your achievements you are most proud of and the liabilities are your greatest fears for the future.
OR
The assets are the things you want to keep treasuring and the liabilities are what you can safely let go of; the best example being attachment to your job pre-retirement.
I offer you the challenge to start to draw up your own personal balance sheet: think of what you want to hang on to and what you want to dispense with.
If you reflect on your own balance sheet for some time, I think the results that you obtain will be interesting.
Retirement: You won’t know what it is like until you get there.