Esperanto is a good tool for international communication. The Internet facilitates international communication with the help of e-mails and social media. Is there a significant amount of active Esperanto-speakers that do not use the Internet, and only use Esperanto in local clubs or in postcards?
There are many elder Esperantists who don't use the Internet. At the Universala Kongreso I discussed with some people about Esperanto radio stations and mentioned podcasts. And they were like, if it's only on the net (and not e.g. shortwave) it's not real.
There are many reasons not to use the Internet:
You cannot afford a computer. Even if you have a computer, you cannot afford the connection. There is no Internet in the area where you live. All of this can happen in any country.
Some people in Africa save as much as they can to pay for one hour at the cyber-cafe. One of them once told me that she have to pedal her bike about one hour (each way) to reach the cyber-cafe.
There are some Esperanto speakers in USA, Europe, and some other countries who send books and other items (paper, pencils) to people that aren't connected to the web.
By the way, next year I will be 80 and I use the Internet, and have a vast web site in 3 languages at:
In France I've been in some local clubs where almost all Esperantists where elders who didn't use internet (with some exception).