When Hollywood actor Nicole Kidman arrived at 55, with toned muscles and a ripped body, posing confidently on the cover of Perfect magazine, many wondered if it was easy for normal 50-plus people to reverse-age as easily. True she had dietary modifications and an intensely focussed workout regimen to achieve the poster look, but fitness is ageless and has much to do with feeling good from the inside out. You may not work for the muscular…