I would expand this to say that it matters how many people in the household. For one person, 55 Mbps is fine for streaming video and 350 GB is fine for downloads, unless you’re d/l multiple AAA games. 350 GB might also cause trouble if you do significant cloud backups.
If you’re in a household of 4 people, that 350 GB is likely to bite, and 55 Mbps is likely to struggle if you’re all watching something different.
Elon Musk & Sergei Brin are Gen X, but Bezos, Gates, Tim Berners-Lee, Steve Wozniak, and most of the people who built the technology GenX grew up with are Boomers. Zuck is a Millenial, but just barely. You could make a decent start of life as GenX knowing nothing about the technology, but they were still young enough to learn new developments easily.