Edit in JSFiddle

var PersonForm = React.createClass({
  render() {
    return <form>
    	<div><label htmlFor="name"/>
      	<input type="text" name="name" value={this.props.person.name}/></div>
      <div><label htmlFor="age"/>
      	<input type="number" name="age" value={this.props.person.age}/></div>
    	<div><input type="submit" value="Save"/></div>    
    </form>;
  }
});

var data = {name:"Eugene",age:46};

ReactDOM.render(
  <PersonForm person={data} />,
  document.getElementById('container')
);