As of May 2026, the official "youngest tube" in the world—defined as the most recently opened major underground driverless metro segment—is Line 15 South of the Grand Paris Express (opened December 2024) , with an honorable mention to Line 13 in Shenzhen, China (opened November 2024) .
However, transit purists argue that a true "tube" requires a small-diameter bored tunnel (like London’s 3.56m diameter). By that hyper-specific definition, the youngest tube is actually the Northern Line Extension in London (Battersea Power Station station, opened September 2021), because the Grand Paris Express tunnels are wider (8.7m) and don't fit the "tube" profile.
When the average internet user searches for "youngest tube," they are often looking for the youngest person to ever achieve fame on YouTube. Historically, the platform has been dominated by adults, but the last decade has witnessed a seismic shift.
The path to modern subways included many small, experimental tunnels and conveyances:
These early “tubes” were “young” technological experiments that seeded the methods (tunnelling shields, ventilation, signaling) used in later large networks.
The phrase "youngest tube" can refer to several distinct topics, ranging from a viral world-record-setting child to medical and social phenomena involving youth and various types of "tubes." 1. The Youngest "Tube" Record Holder In a literal sense, the "youngest tube" refers to Lewis Wing
, a six-year-old London Underground superfan who became the youngest person to visit all 272 London Underground stations
Lewis completed the mission over three years, finishing at the Battersea Power Station and Nine Elms stops in September 2021. The Motivation: youngest tube
Growing up near a station, Lewis developed a passion for the network by age three and can now recite the entire map by heart. 2. "Tube" Platforms and Young Children The term is frequently used in discussions about and its youngest users. The Impact: 80% of children aged 0–7 use YouTube, with 59% using the dedicated YouTube Kids app. The Creators:
One of the most famous early examples of a child "Tube" influencer is
(Evan Lee), who began toy reviews in elementary school and grew a following of over seven million subscribers.
Experts note that while these platforms provide entertainment, young children spend an average of 1.4 hours per day
on the site, often viewing content centered on play, toys, and nursery rhymes. 3. Medical Tubes in Young Patients
In the medical field, "youngest tube" often refers to the early application of feeding or ear tubes: Ear Tubes:
These tiny devices are commonly used for children with chronic ear infections to help drain fluid and equalize pressure. Feeding Tubes (NG and G-Tubes): Nasogastric (NG) Tubes: As of May 2026 , the official "youngest
Used for young people with severe malnourishment, often due to eating disorders or digestive issues, to provide essential nutrients directly to the stomach. Gastrostomy (G) Tubes:
Recent guidelines aim to reduce G-tube placement in patients 2 years old or younger
by 10%, encouraging oral feeding whenever possible to avoid potential hospitalizations and surgical complications. 4. "Youngest Child" Dynamics
Sometimes, "youngest tube" is a typo or shorthand for discussions on "Youngest Child Syndrome" within families.
Ear Tubes: When Do We Need Them? - Frontiers for Young Minds
“Youngest tube” can mean the latest opened metro line, the physically smallest tunnel systems, the early experimental tubes that gave rise to subways, or the emerging micro-tunnel solutions enabling nimble urban transit. Across these meanings, the common thread is adaptability: modern urban transport increasingly favors right-sized, tech-enabled tubes that deliver connectivity with lower cost and disruption—opening fresh possibilities for cities that need efficient, compact transit.
If you’d like, I can:
| Context | “Youngest Tube” | Key Detail | |--------|----------------|-------------| | YouTube | Like Nastya (age 2 start) | 120M+ subscribers | | Subway (world) | Sydney Metro (2019) | Fully driverless | | Subway (London) | Elizabeth Line (2022) | 117 km long | | Biology | 8-week embryo fallopian tube | ~3 cm long | | Electronics | Nano-vacuum tube (10 nm) | Space-grade | | Botany | Current year xylem vessel | Just below bark |
If you meant a specific “youngest tube” (like a brand, product, or slang term), please clarify and I’ll tailor the content exactly. Otherwise, the above covers 99% of search intents.
The title of "youngest tube star" has changed hands several times. In the early 2010s, a child reviewing toys was a novelty. By 2020, it became a business model. However, the current record holder for the youngest solo creator to monetize a channel is fascinating.
Consider Ryan Kaji (of Ryan’s World). While Ryan is no longer the youngest (he started at age 3), he set the precedent. Today, children as young as 18 months appear in viral clips, though the term "youngest tube creator" legally refers to those over 13 who operate channels independently (per COPPA laws).
The concept of the "youngest tube" is a moving target. It is a title that represents human ambition, engineering pain, and urban salvation. Every time a city finishes one line, two more are drawn on a blueprint.
For the enthusiast, chasing the "youngest tube" is a global scavenger hunt. One month it is deep beneath the Seine in Paris; the next, it is under the skyscrapers of Shenzhen. But one thing is certain: The youngest tube is always the best tube—until tomorrow’s opening ceremony.
Next stop: Line 18, Paris, 2026. Set your calendar. “Youngest tube” can mean the latest opened metro
Keywords used: youngest tube, new metro line, fully automated subway, Grand Paris Express, Line 15 South, driverless underground, modern rapid transit.