Time does not stand still, and to assume that China will is foolish. With wealth comes power, and China's military will likely be unrecognizable in 30 years. To underestimate one's enemy is simply stupid.
My first reaction on reading your decision to not get married or have children in order to have more time, is that you should think about adopting a more balanced approach to life.
I find it really useful to prepare all "menus" in advance for the week. Preparing food in advance for the week doesn't really work for me as I like to eat fresh food. Not having to decide what to eat on the fly saves me so much mental bandwidth. It can make the shopping more efficient too.