If you want to look younger, you've got to start with the eyes. I have read that studies show that when people look to examine age, they look first in the eye area and I don't doubt it. Let's face it: the eyes are not just the window to your soul but to your biological age as well.
The eyes generally have three issues that make you look older. The first is wrinkling from normal aging processes. The skin around the eye ages from free radical damage, sun and AGE's just like the rest of your skin. The eyes, though, are particularly susceptible to another kind of wrinkling: motion or movement lines. Motion wrinkles occur from daily activities such as squinting and all the other expressions that you do throughout the day - it's simple "wear and tear" on the skin. Finally, many of us guys have those bags under the eyes. These can have that purple, tired-out shade to them and can be large enough to actually stretch and sag the eye skin.
You put all of these together and you start looking older very quickly. Fortunately, there are some excellent solutions out there, most of which can be done in the privacy of your own home or with considerable secrecy and stealth - always important to us guys.
Here's a few of the big guns that can dramatically help your appearance in the are of your eyes:
1) Sleep. It's no secret that lack of sleep can make you look tired and increase the bags under your eyes. Some scientists believe that the reason is that the extraocular eye muscles are literally exercised when you are in your REM sleep cycle stages throughout the night. The less sleep, the less REM cycles and the more these bags build up. 
2) Haloxyl. Haloxyl is a combination of Matrixyl, a collagen builder, and Chrysin/Hesperin, which break down "leaking blood" in the eye area. Haloxyl has some clinical backing and works for some people (and others not). It may be worth a try since it is relatively inexpensive and completely private.
3) Preparation H. You read that right: to remove puffiness in the undereye area, you can always try this old standby. Do not use more than 2 or maybe 3 times per week. Some people swear by it and others think it's kind of anal.
4) Topical Vitamin K and Retinol. One study showed that "Topical application of the gel containing 2% phytonadione, 0.1% retinol, 0.1% vitamin C and 0.1% vitamin E was fairly or moderately effective in reducing dark under-eye circles, especially in cases of haemostasis, over a short treatment period in healthy Japanese adults. This treatment also slightly decreased wrinkles".  Dark circles and wrinkles in one shot? This is good news, plus Vitamin K creams are availble in many products including moisturizers. One manufacturer combined all of these ingredients, except retinol, into one product NeoStrata Bionic Eye Cream,. However, the retinol can be purchased in other products over the counter products. NOTE: Retinol is converted to retinoic acid, i.e. Retin-A, and therefore is generally less irritating to the skin.
5) Retin-A (Tretonoin). Retin-A can help in the eye area as well. However, you do have to be careful, because the skin in area of the eye socked is thinner with less fat than other places on your face. So if you irritate and inflame this area, you can cause more damage than harm. Some people use a lower strength in the eye area (.05 or .025) and some people do every other day to play it safe. REMEMBER: Retin-A will not help with "motion wrinkles".
6) At Home LED Treatments. LED light treatments have been done for several years now in doctor's offices (a.k.a. Gentlewaves) and were approved by the FDA for the more delicate skin in the eye socket area. The reason is that LED treatments are gentle and have "no pain, side effects or downtime". However, you can now buy the above system for over the counter home use and is sold as the OmniLux New-U. The beauty of this is that no one ever needs to know. These systems works through the application of infrared and red light to the skin which then stimulates collagen production. This is beautiful, because the eyes are very difficult to treat effectively without injuring and inflaming the thin skin around the eye socket. Yet it is critical if you want to shave years off your appearance as studies reveal that people look at the eyes to discern the age of someone they meet. The eyes are the "window to the soul" and to your biological age as well. The general consensus is that LED treatments tend to work well to remove fine lines and wrinkes in the eye and some surrounding areas. There are a couple of studies showing its effectiveness. 
7) Botox. If you have motion wrinkles in the eye area - and it is very likely to one degree or another if you are middle aged or beyond - then Botox is king. Read about Cosmetic Surgery for Males for the good, the bad and the ugly regarding Botox.
8) Hyaluronic Acid Fillers. In some cases fillers can be injected into the eye area to diminish the appearance of lower eye bags. This, of course, must be repeated and thus is not "curative". However, it can work quite well. Again, read about Cosmetic Surgery for Males for more details.
9) Blepharoplasty. A blepharoplasty can remove the excess skin from upper and lower eyelids and remove the bags from the lower lids and, if done well, take ten years off your appearance in a matter of a few hours. Of course, like so many things in life, the primary issues are time and money: this surgery takes 7-10 days to recover and you may need a few days after that for the redness to completely disappear. The cost is in the thousands depending on what you have had done. You may want to read this link which has many reviews of those who have undergone the procedure.
The bottom line is that there is no excuse not to look better - a lot better.
1) Men's Health, Sep 2009, p. 134.
2) J of Cosmetic Dermatology, 3(2):73-75, Published Online: 19 Nov 2004, "The effects of topical application of phytonadione, retinol and vitamins C and E on infraorbital dark circles and wrinkles of the lower eyelids"