Yelin, 50, is mother to a 22-year-old son. She is often mistaken as his girlfriend. With a wrinkle-free face and toned body, Yelin is a super-fit mom with over 75k followers on a Chinese social media site called Weibo and 12k on Instagram. Wondering what is her secret ? No, it’s nothing like what we saw in Blake Lively starrer movie, The Age of Adaline. Yelin has a strict daily fitness routine ,and she eats a healthy, balanced diet. But what seems to have done miracles for her is swimming. Yelin goes for a swim in the lake even in winter.Last year, Yelin swam from shores of Penang, Malaysia to the Strait of Malacca in four hours, which is 7.45 miles. Weight training is also a part of her routine. She does weight training every single day. Here are some pictures of Yelin who could be the fittest mom in this world.