Classic Think About Coming Back

Hi all! Lately I have been watching YouTube videos about WoW and I am tempted on jumping back in. Last time I played was Cataclysm so I know stuff has changed. I was around level 83 when I left, if I were to go back what level would I be at and can I finish the old content?Thanks in advance! via /r/wow https://ift.tt/Zd5YOJi