My advise and priorities are a bit different. I'm a 22-year-old graduate student and will be one for several years (Hoping I pass my PhD candidacy exams!

) and it also means I've taken a vow of poverty, as it were. So I can't really give advise about kids and mortgages and retirement because I have no kids, rent, and don't get any retirement as a student. But I do try to put away as much of my cash as possible so I won't be starting at 30 or something trying to save for the future.
1) Track all your spending. I have a spreadsheet. I pay most things on credit card since as a woman I don't feel comfy carrying scads of cash with me to buy groceries each week. But all credit card purchases go in, all utilities, rent, whenever I take cash out, that goes in. And I track from month to month, semester to semester how much I'm saving. Obviously it goes higher when I have one of my yearly major expenditures (an anime convention I go to every year, Christmas presents, etc.) but I have never spent more than I made in a single month. And I think that's the biggest thing.
2) Buy the store brand. Seriously. The black beans in a Giant Best Value can for $0.89 taste just as good mixed into your tacos as the $2.00 brand ones. Little bits add up.
3) Buy meat in bulk and freeze it. Costs way more to buy meat each time than it does in packages. Try to watch for sales on meat and stock up then. But I'm finding those are becoming far and few between lately.
4) COOK! I can't believe how many of my fellow students (heck, even you proper adults with actual salaries

) are spending on food when every single lunch is eaten out. Pack a sandwich. Do the math on a dish you make and be amazed at how much cheaper it is than an equivalent meal at a restaurant.
5) Meal plan smartly. Always have your groceries for at least the week laid out so you don't have food waste. And if you're getting a specialty ingredient, plan more meals to use it up. We make a curried fish and rice dish with curry paste recently. You don't just keep that in your fridge like milk and eggs and it would go bad. So we're doing Chicken Korma this week to make sure we get our money's worth out of it. Don't waste anything! Letting food spoil is like throwing money away.
6) Call cable/TV/phone companies and make sure you're getting the lowest rates possible. If you're in an area with competition, threaten to leave. Actually leave if you have to.
7) Have the cash for something before you buy it. Just because I use CC's doesn't mean I carry a balance. Never have,
hopefully never will. I took my Disney trip after researching to make it as inexpensive as possible for what I wanted and then made sure I had enough saved before doing it. It's not that hard. If there were no such things as credit cards we wouldn't be able to spend what we didn't have. So why does plastic somehow make that okay to do?
8) And my controversial tip, splurge smartly! It's depressing as heck to feel like you're pinching pennies all over and never getting to do anything "fun." One major trip or event or whatever you're saving for can sometimes not feel worth it. So indulge, but in a good way. If you have a coupon, go to the restaurant. Buy a fancy coffee drink - just don't do it every day. Something I like to do is buy lunch while I'm in the office, but on the cheap. I'll bring my drink/chips/etc from home and just go get a fancy takeout sandwich and bring it back. I get the feeling of treating myself, but I only spent $4-5 instead of $10 for the whole meal.
I realized a lot of my tips focus around food...

I guess since that is my major expenditure and pretty much the only thing I can control (Rent, utilities and insurance are about the same even with cost-saving measures in place) it's where I try to save a lot of my money. Plus they say students are rather fixed on food anyway...

So I hope this was interesting/informative for someone!