If you're starting to feel old, check out this list from Health.com.  According to them, if you do the four things on this list you'll actually FEEL a lot younger than you are.

#1.)  Go to Bed Earlier.  Obviously, more sleep equals more energy.  But you have to make it a habit.  Getting eight hours of sleep doesn't make a huge difference if you go right back to getting SIX hours the next night.

--And since you probably can't wake up any later than you already do, going to bed earlier is the only way to make sure you're always rested.

--After six straight weeks of getting eight hours a night, you'll have more energy, and the dark circles under your eyes will start to fade.

#2.)  When You Exercise, Focus More on Your Lower Body and Your Core.  Men in particular tend to concentrate on upper-body workouts, which are fine.

--But if you're feeling old, try doing more lower-body exercises . . . like squats, lunges, calf-raises, or just plain old running.

--Stronger legs and a stronger core will make you feel lighter on your feet.

#3.)  Break Out of Your Routine.  Even if you eat right and exercise every day, you'll start feeling old if you don't mix things up a little.

--According to Caroline Adams Miller, author of the book "Creating Your Best Life", quote, "The brain craves novelty.  To feel younger, you have to stimulate it with new associations and new things."

--And those things can be small, like getting your morning cup of coffee from a different place than usual, or trying a new route to work.

#4.)  Listen to an Album You Loved 20 Years Ago.  Researchers at Harvard University found that when they exposed people to movies, music, and memorabilia from their youth, they were happier and experienced fewer health issues.

--Some of them even saw improvements in their vision and memory.