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Reba McEntire revealed the "hardest lesson" she's ever had to learn.

After turning 70, McEntire is now sharing her best advice for a good life, which includes choosing not to stress about "the little stuff or the big stuff."

The country music star said the hardest lesson for her to learn in life was to "quit living for tomorrow and for yesterday," McEntire told People magazine . "That’s really hard to do, but it’s so rewarding when it clicks."

"I used to think being content was a no-no, because if you're content, you're not going to strive to continue to do better," she explained. "That's not true because you always try to improve your health. As I tell artists on ‘The Voice,’ and anybody that ever asks me for advice, I'

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