When it comes

The more candles on your birthday cake, the weaker your immune system -- your body's defense against germs. Cruciferous vegetables like broccoli, Brussels sprouts, and cauliflower could help shore it up. They have a chemical called sulforaphane that switches on your immune cells so they're better able to attack toxins that damage your cells and cause disease over time. Eat them often, and you may lower your risk of some types of cancer.

Watermelon, strawberries, tomatoes, red and orange bell peppers -- these fruits and veggies are rich in a natural compound called lycopene. Studies show foods that have it could lower your risk of some types of cancer and may protect you against strokes, too.

They're a tasty way to protect your brain as you age. Blueberries contain polyphenols -- compounds that lower inflammation throughout your body. They lessen damage to your DNA that can make some diseases more likely. They also improve how well your brain cells "talk" to each other. Fresh blueberries are best, since their polyphenol content goes down when you bake them into muffins, breads, or pies.

The calcium in dairy keeps your bones healthy. As you get older, it can also lower your risk of osteoporosis, colon cancer, and high blood pressure. After age 50, you'll need 1,200 milligrams of calcium each day, which you can get through fat-free and low-fat dairy products. Milk and cheese aren't you're only options. You can still hit your calcium goal through things like yogurt, rice and soy drinks, fortified orange juice, and tofu.

Protein-rich foods fight the natural muscle loss that happens as you get older. As much as you can, enjoy your protein in "real" food like eggs, lean meat, and dairy products instead of protein powders that may not give you as many nutrients.

Fatty fish like salmon, albacore tuna, herring, and farmed trout should be on your menu twice a week. The reason? They're high in DHA, an omega-3 fatty acid that's good for your brain. Low levels of DHA have been linked to Alzheimer's disease, but get enough of it, and you may improve your memory and ability to learn new things. If you don't eat or like fish, algae, walnuts, flaxseed, and chia seeds are also good sources of DHA.

As you go up in years, not only does your body lose water, but your sense of thirst starts to fade. That means it will take you longer to know when you're low on fluids. Water is food for your health in lots of ways. It cushions your joints, helps control your body temperature, and affects your mood and how well you focus. Make eight glasses of water each day your goal.

Yes, they're small, but tree nuts like almonds, walnuts, cashews, pecans, and pistachios have big anti-aging powers. These crunchy snacks contain special nutrients that can help delay or prevent age-related heart disease, stroke, type 2 diabetes, nerve disease, and some types of cancer. Nuts also protect your brain as you age.

They're a great source of fiber and rich in B-vitamins, which you'll need more of as you age. B-6 and folate are key to keeping your brain healthy. Even a small shortage can make a subtle difference. Whole grains could also cut your chances of getting heart disease, cancer, and diabetes. Don't stop at whole-wheat bread, though. Quinoa, wheat berries, and whole-wheat couscous are tasty options, too.

When it comes to p***s size, men always hear that size doesn't matter to women. While this may be the case for most, it's not so much about having the biggest p***s as it is fitting with your partner. "I'm not going to pretend it doesn't matter," Davidson says. "There are plenty of women for whom it absolutely does. But I prefer to focus on the idea of the right fit."