If someone as out of shape as me can climb the tower, you can do. It’s actually an affordable alternative for a larger family and can save you some time waiting in line for the elevators. If you want to ride the elevator, book early. If you don’t, I have a way to help get you there when you think it’s too late.
Our visit to the Eiffel Tower was a brief one. We made the mistake of not booking tickets far enough in advance. You can buy tickets online weeks or months in advance, something I would highly recommend.