By Niamh Kirk Looking old isn’t an issue for this glamorous woman – and she credits her youthful appearance to a diet she “swears by”. Harrah Brown revealed the simple rule she lives by when it comes to her weekly food shop, as it has helped her look decades younger. The 64-year-old regularly shares inspirational videos on TikTok inspiring women by saying they can look good no matter what age they are and, in her latest video, she unpacked her food shopping while revealing her one rule that helps her look and feel young. She claimed it also helped her to lose her “menopause belly fat and becom…