By starting early or saving while you are young, you develop the habit of saving, one that you would carry with you until you are old. I started saving since I was in my early 20's and have been continuously doing so for the last few years. I have big expenses here and there that pop up every now and then but I always try to make it a point to save each time I receive my salary.
That is a really great thing if someone can do that, but mostly people has less patience and that is the reason they can't save anything but spend everything without thinking twice, they buy things which are not really important because they cant control themselves when they have money.
We all tend to overeat and overeating means overspending. Before you get out of your house, carry a little notepad with you. Every single thing that you buy, especially eat, should be written in that. In that way, you'll see that you're overspending. While eating, savor the taste of the food. Don't eat quickly. Eat really slow so you can enjoy your food. We all get that feeling of regret once we ate a lot of food real quick and think that you already miss the taste of that food and that makes you want to buy again. 
