Avoid buying into the American way of going into constant debt. I live in Santa Clara County aka Silicon Valley, one of the most expensive areas in the nation. Live in a 60s era 2 story 2 bdrm 4-plex townhouse with poor wall insualtion. Yet have lived 5+ years since retiring on my monthly SS benefit check without using any of my bank saving/assets.
Many people at all economic levels eat out for many meals from restaurants and fast food and convenience stores. Much cheaper buying from supermarkets, especially low cost markets, and preparing one's own food, snacks, meals. And what about your meat every meal habit? Or daily alcohol/cigarettes/drugs/gambling? Not got for your health or pocketbook.
Also many are addicted to a list of telecom services, especially tv. Also energy costs of warming/cooling one's residence and lighting/appliances that really don't need to be turned on 24/7. Use open or closed windows/doors times of day to control temperature. Wear warm clothes in winter. Many people only go on expensive package vacations. There are plenty of inexpensive alternatives for leisure and vacations.
David: Never wealthy, never ever in debt. Summer AC and winter heating turned of for 2 decades. Electric/gas bill about $40/month. Only Internet access and web hosting telecom bill as in no cable/streaming, cheap telephone service.