How has Jennifer Lopez not aged a day in nearly a decade?  The gallery below shows that even 40 looks fabulous on the mother of 2-year-old twins Max and Emme! “Her beauty [style] is timeless,” explains celebrity makeup artist Jim Crawford.

“She pays very close attention to little details, and she doesn’t get carried away with trends. She sticks to what works for her, what plays up her natural beauty.”

In J.Lo’s case, it’s a bronzed, dewy complexion. Her flawless skin is her secret weapon.

But there are also makeup tricks that enhance a youthful look — and J.Lo knows them all. A pale mouth with a “hint of shimmer” makes lips look fuller, says Jim.

“There’s always a balance on her face: a little dramatic here, a little understated there,” he adds. “Her makeup is never overdone.”

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