The writing style, presentation and tools recommended are optimised for the younger generation. This does not mean people who are 35+ can't use the service.
In fact, a little above 60% of the website's traffic comes directly from search engines. Less than 10% of these users make it to the homepage. They have no idea the website is designed for the under-35s, and they use it still.
The tools are relevant for everyone. It's just much easier to focus on one or two age groups now rather than everyone.