import state and stateless components

App.js

import React from 'react';
import ReactDOM from 'react-dom';
import {Header} from './Header' //with state

import Header2 from './Header2' //without state


export class App extends React.Component {
  render(){
    return (
      <div>
        <div className="">
          <h1>Hello</h1>
          <Header age={37}/>
        </div>
        <div className="">
          <Header2 age={33}/>
        </div>
      </div>
    )
  }
}