You can work out every day, eat the healthiest food, and get plenty of sleep, but no matter how hard you try, you might not be able to avoid the emerging phenomenon of adult-onset allergies, which can strike at any age, regardless of whether you suffered sniffling and wheezing as a kid. According to a 2009 review in the journal Allergy, being exposed to allergens your entire life can boost the chances of your becoming allergic to them later on. And allergists are finding that these allergies are more than just standard seasonal reactions to hayfever or pollen. They're discovering allergies to some really strange things, some of which are misdiagnosed often, leading to more misery for you, the allergy sufferer. So if you want to stay allergy free long into your retirement, we've got some tips to protect you.