Environment aside is idling a crappy car before driving better than not? All the answers to the like questions always say if you have a new car there is no difference except waste. Is this still true for older cars?
Newer or older (subjective as noted in comments) doesn't really matter. Idling a cold engine for a few minutes to allow the oil to warm and flow through the engine is better than running the engine cold under load with insufficient lubrication. When cold, oil collects in the oil pan and is thicker. Once the engine idles for a minute or so, oil is circulated to the top end (camshafts/valves) and rotating assembly, ensuring those parts are lubricated.
If the vehicle is turbocharged, it's recommended to allow the oil to warm to operating temperature before putting it under significant load (approx 90C). "If a cold engine was brought to high speeds immediately after the start, there is a risk that the oil supply in the turbocharger is not yet sufficient and hence the oil film in the turbocharger tears off." Source: http://www.enginebuildermag.com/2015/10/how-oil-change-habits-are-killing-turbos/
I did read in an owners manual for a 2013 car that recommended not warming the engine at idle beyond 5 minutes. It gave no explanation beyond that.
If an engine is warm, there really is no difference between shutting it off and restarting for short stops (such as a stop light) beyond the excess wear on the starter and starting load on the battery. The fuel saved is minimal and of less cost than a starter repair.
From what I remember from an article which I don't have to hand, idling a cold engine is bad practice, old or new. If your intention is to warm the oil, driving gently away puts a greater load on the engine and therefore generates more heat which brings the oil to operating temperature quicker.
Some vehicles, especially diesels, can take upto 20 minutes to come up to operating temperature at idle and until the oil reaches operating temperature, it isn't providing effective protection. I will try and dig out the article but IIRC it was advice backed by one of the major oil companies. A quick Google search turned up this article from popular mechanics which seems to echo the one I've read.