My son is 30, and still staying with us. Recently he has been spending a lot more unnecessary money (eg when he doesn't like our cooking, he will order food). Should I start charging him rent instead?

This is the worry in most people now. On my ERA, we already do partime

at age 16 to have pocket money and start work age 23 . since he has good job , he should contibute to the household, of course after marriages, it can be very hard for him to contribute. Take care your own finance or retirement plan too.

What has charging rent and ordering food has to do with each other?

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if you think he wasting money ordering food, then ask him to order for you too so that you can eat together and you can also not need to cook. Asking him to pay rent would definitely baffle him and likely cause some resentment. If ordering for you all the time makes him feel the pinch, I am sure he will return to eating your food instead. Achieve with no harm and maximum benefit for you ( less cooking and enjoy free food).

Yes you should, else he will take u for granted

I have encoutered a similar scenario, except that the troublemaker is my brother - not helping for houseworks, play games till mid night and shouting occassionally, etc.

I send him few warnings and eventually asked him to move out - it is not a pleasant experience and I was blamed by my parents for doing so, however it turns out to be a good decision.

My relationship with my brother becomes much better now after he moved out - probably he has more freedom outside and doesn't need to bear my nag anymore...