People are acting as though we're going back to a pre-industrial economy with this. It's not true. The power isn't going out. The water will continue to come out of the tap. So my suggestion short term is: learn to cook if you don't know how to. Not fancy, haute cuisine, but how to take whatever's in the pantry and make something tasty out of it. Learn how to grow some produce in small spaces, even if it's just herbs…
senior positions that require many years of experience for entrancy due to the nature of the job may suddenly go vacant with noone to fill them.
when older people, {people who understand how to retool and operate a VLSI plant for example, people who are ATCs or surgeons} die and there is only a pool of young inexperience to draw from we will have to make do without some of these things, change laws to allow reduced qualifications, and or accept things like nuclear accidents as a learning curve until we have experienced people ,[after the replacements make time in]