Kids are back at school, summer vacations have wrapped up, temperatures are dropping, and before long, people will be headed back inside. All of that will boost cold, flu, and COVID-19 infections. And of course, if you’re getting on in age, that can be very scary news. Older adults tend to suffer stronger reactions to these types of viral infections, largely due to weakened immune systems. Like your senses, muscles, and vitality, immunity typically declines with age. It’s just part of the process: The longer you’ve been alive, the less fuel you have left in the tank. But immune function doesn’t have to decline rapidly, and it’s not entirely up to your chronological age. There are things you can do to boost your immune system, improve your natural ability to limit illness, and potentially prevent infection or severe symptoms. One of the smartest things you can do for your immune …