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The Chinese mother of one who rarely wears makeup is nearly 50 years old yet looks so young people think her 22-year-old son is her boyfriend. Without a wrinkle in sight and a super-toned body, Liu is constantly stunning people with her looks. “People are often shocked to find out I’m almost 50,” Liu Yelin (49) told Mail Online. “Whenever I went shopping and told people my real age, I often got mobbed by strangers who wanted to find out my secrets.”So, what is that secret of hers? Regular exercise for three decades. “I swim in the lake and do weight training every day,” she said. “My favorite thing is swimming outdoors in winter.” In fact, Liu has swum across the Yangtse River in China and the Han River in South Korea. And last year, she swam from the shores of Penang, Malaysia to the Strait of Malacca – that’s a whopping 7.45 miles in just 4 hours!