Most teenage TikTok accounts chase whatever sound is trending this week. Mariah Aliyana Soutar built hers around a mood. Posting as MariahTheOptimist, the Brisbane creator has made relentless, slightly goofy encouragement her trademark, and in roughly two years it has carried her from freshman year posts to a contract with an Australian modeling agency.
That is a fast climb. It is also a young one. She turned 17 in September 2026, which shapes how her career works, how she earns, and how much of her life anyone outside her family should expect to see.
Mariah at a Glance
| Full name | Mariah Aliyana Soutar |
|---|---|
| Online name | MariahTheOptimist |
| Born | September 19, 2009, in Brisbane, Queensland, Australia |
| Age | 17 (as of October 2026) |
| Nationality | Australian |
| Heritage | Maori and Pacific Islander, plus European (English and Scottish) ancestry |
| Height | 5 feet 8 inches (173 cm) |
| Work | TikTok creator and model |
| Agency | Tamblyn Model Management |
| Active since | 2024 |
| TikTok | @mariahaliyana (230,000+ followers) |
| @mariahalyana | |
| Relationship status | Private |
| Net worth | Icon Polls estimate: $100,000 to $150,000 |
A Brisbane Kid With a Point of View
Mariah was born and raised in Brisbane. Her background mixes Maori and Pacific Islander roots with English and Scottish ancestry, and the Soutar surname itself traces back to Scotland and northern England. She grew up in a Christian household with two sisters, and her family turns up in her videos now and then, which gives the account a lived-in feel that a lot of polished lifestyle pages lack.
She was around 14 and in her first year of high school when she started posting in 2024. That timing matters. She is not a former child actor or an influencer's daughter with a head start. She is a regular student who figured out the platform in real time, in public.
Why the Feed Works
On paper, her content sounds like everyone else's: beauty transformations, aesthetic lifestyle compilations, comedic memes, dances and lip syncs. She arrived just as the "aestheticmaxxing" trend was taking off and rode it well.
The difference is tone. Lines like "Ur authenticity makes u cool btw" have become her signature, and they land because they are delivered without the sugar coating that makes most motivational content unbearable. She manages to look polished and sound unbothered at the same time. That is a harder trick than it looks, and it is why her relatable student clips and memes started pulling followers who had no interest in a makeup tutorial.
Our honest read: the optimism is the brand, and it is a smart one. Positivity ages better than a dance trend, and it travels across niches.
From Aesthetic Clips to an Agency Contract
By 2026 her TikTok had passed 230,000 followers with millions of likes, and she had built a parallel presence on Instagram. The bigger step, though, was signing with Tamblyn Model Management in Australia. At 5 feet 8 inches she is tall for her age, which helps on a casting sheet, and she has been working on regional campaigns through the agency.
Brand interest followed. Her most visible deal so far is a paid partnership with EvryJewels, a natural fit for an account built on looks and lifestyle. One sponsored post does not make a career, but it shows brands see her audience as worth paying to reach.
In 2026 she also spent time in the United States on a student foreign exchange program. For a creator whose content leans on everyday school life, a change of scenery is useful material, and it gave her feed an international flavour that may help her audience grow beyond Australia.
The Money Question
There is no official figure for what Mariah earns, and anyone claiming precision is guessing. Icon Polls estimates her net worth at somewhere between $100,000 and $150,000 in 2026.
It is worth being clear about where that money likely comes from. TikTok's own payout programs have generally required creators to be adults, so a 17 year old is unlikely to be earning much directly from views. The realistic sources are brand partnerships like EvryJewels and modeling work through Tamblyn. That makes her income lumpier than a big creator's, but also less dependent on any single algorithm change.
If the follower count keeps rising and the agency work grows, that estimate should rise with it. If it doesn't, it won't. That is the plain truth of creator money.
What We Are Leaving Out
Older profiles of Mariah, including a previous version of this page, listed her weight and body measurements. We have removed them. She is a minor, and those details add nothing to understanding her work.
Her romantic life gets the same treatment. She has not confirmed any relationship publicly, and her content sticks to friends, family, school and creative projects. She keeps her private life private, and at 17 that is exactly the right call. The name of her school has never been made public either, and we see no reason that should change.
Where She Goes From Here
The next two years are the real test. Finishing school while managing an agency, brand deals and an audience in six figures is a lot, and plenty of teenage creators burn out or simply move on. What works in Mariah's favour is that her appeal is not tied to one trend. An upbeat personality can carry a creator into fashion, beauty, lifestyle or even presenting work as she gets older.
Whether she becomes a household name or stays a well loved regional favourite, she has already done something difficult: built a following on encouragement rather than outrage. If you have opinions on which creators deserve the spotlight, browse more creator profiles and polls on Icon Polls and make your vote count.
Quick Answers
How old is Mariah Aliyana Soutar?
She was born on September 19, 2009, so she is 17 as of October 2026.
How tall is Mariah Aliyana Soutar?
She is 5 feet 8 inches, or about 173 cm.
Which agency represents her?
She is signed with Tamblyn Model Management in Australia, which handles her modeling and campaign work.
