Tata Sons Chairman Emeritus Ratan Tata celebrated his 84th birthday on Tuesday by blowing out candles on a cupcake. A video posted by Vaibhav Bhoir, a manager at Tata Motors Finance, showed Tata's 28-year-old business assistant Shantanu Naidu singing a birthday song for him and feeding him the cupcake. "Simplicity....Nation's pride and inspiration for all," Bhoir wrote on LinkedIn.