One thing I kept coming across while drinking different Chinese teas was the idea that some teas are “cooling”, while others are “warming”.
At first, it sounds straightforward.
Green tea is cooling. Red tea is warming. Oolong sits somewhere in the middle.
But the more teas I tried, especially older white teas and raw Pu’er, the less useful these simple labels became.
What about a raw Pu’er that has been stored for twenty years? Is it still considered cooling?
Is a ten-year-old white tea the same as a freshly made Silver Needle?
And with oolong, how do you put a green Tieguanyin and a heavily roasted Wuyi Rou Gui in the same category?
The answer, at least from the traditional Chinese understanding of tea, is that you probably shouldn’t.
Tea nature — 茶性 — can change.
A quick note before going further: 寒 (cold), 凉 (cooling), 平 (neutral) and 温 (warming) belong to the traditional Chinese way of understanding food and tea. I use these terms here in that context. They shouldn’t be taken as scientifically established medical effects.
A rough guide
| Tea | When young | With age |
|---|---|---|
| Green Tea 绿茶 | Cooling | Usually drunk fresh |
| Yellow Tea 黄茶 | Cooling to mild | May become gentler |
| White Tea 白茶 | Cooling | Moves towards neutral, sometimes mildly warming |
| Oolong 乌龙茶 | Neutral, sometimes cooling | Depends greatly on roast and oxidation |
| Red Tea / Hong Cha 红茶 | Warming | Remains warming, usually becomes mellower |
| Raw Pu’er 生普 | Cooling | Gradually moves towards neutral |
| Ripe Pu’er 熟普 | Neutral-warming to warming | Remains warming and becomes mellower |
| Dark Tea / Hei Cha 黑茶 | Neutral to warming | Generally becomes mellower |
I wouldn’t treat this table as a set of hard rules. It is more useful as a map.
Green Tea 绿茶
Green tea is probably the easiest one.
It is generally considered cooling, and unlike Pu’er or white tea, we normally aren’t buying green tea with the intention of keeping it for twenty years.
Freshness is part of its appeal.
Longjing, Biluochun and Huangshan Maofeng are made to retain that fresh character, so there isn’t much reason to create an elaborate aging scale here.
Green tea: generally cooling.
Yellow Tea 黄茶
Yellow tea is a little gentler.
Its processing begins somewhat like green tea, but the additional 闷黄 (men huang) process changes the leaf and removes some of that sharp green character.
I would still put yellow tea on the cooling side, just not necessarily as far along that side as a very fresh green tea.
Age isn’t normally the main story with yellow tea either.
White Tea 白茶
This is where things get more interesting.
Fresh white tea is generally regarded as cooling. But people don’t speak about old white tea in quite the same way.
As white tea ages, it slowly loses some of that fresh, youthful character. The aromas deepen, the liquor changes and the tea generally becomes softer and more settled.
In traditional terms, its nature is also commonly described as becoming less cooling.
So rather than simply writing:
White tea = cooling
I find this more useful:
Fresh white tea → cooling
A few years of age → less cooling
Well-aged white tea → closer to neutral, sometimes described as mildly warming
There isn’t a magical year when this happens.
A seven-year-old tea doesn’t wake up on its birthday and suddenly become neutral.
Storage matters. The material matters. Whether it is loose or compressed matters. Even within white tea, Silver Needle, Bai Mu Dan and Shou Mei don’t necessarily develop in exactly the same way.
This is why the age on a white tea actually tells us something important.
Oolong 乌龙茶
Oolong is the category where I would be most reluctant to give one answer.
Think about the range.
A modern green Tieguanyin and a heavily fired Wuyi Rou Gui are both oolong, but they can feel completely different when you drink them.
A lightly oxidised, lightly roasted oolong may sit around neutral or even lean slightly cooling.
Traditional oolongs tend to move towards neutral.
Then we get to Wuyi Rock Tea.
A strongly roasted Yancha can feel distinctly warming, especially when the roast is still relatively fresh. Give it time for the fire to settle — 退火 — and the whole thing can become much more integrated.
So with oolong, “How old is it?” isn’t actually my first question.
I’d ask:
How oxidised is it? How heavily was it roasted? And how long has it rested since roasting?
Those questions probably tell us more.
Red Tea / Hong Cha 红茶
Hong Cha is much easier.
It is generally considered warming.
Age can soften it and change its aroma and flavour, but we don’t see the same dramatic movement from cooling towards neutral that we see with raw Pu’er.
A young Hong Cha is warming.
An older Hong Cha is still generally warming — perhaps just rounder and mellower.
And just to avoid the usual terminology confusion: Chinese 红茶 is what English speakers normally call “black tea”.
Raw Pu’er 生普
This was the category that made me think about age most seriously.
Young sheng and twenty-year-old sheng really shouldn’t be discussed as though they are the same thing simply because both are 生普.
Young raw Pu’er is generally considered cooling. It can also be bitter, astringent and quite forceful.
Then time gets involved.
Very roughly, I think of it like this:
0–3 years: cooling
3–10 years: still cooling, but beginning to soften
10–20 years: moving towards neutral
20+ years: generally much closer to neutral; sufficiently transformed examples may be regarded as mildly warming
But I would be careful with those numbers.
Storage can completely upset the timetable.
A twenty-year-old cake kept in very dry conditions may have transformed much more slowly than another twenty-year-old cake stored somewhere warmer and more humid.
So when someone tells me a sheng is from 2003, the year alone isn’t enough.
I also want to know where it spent those twenty-odd years.
Ripe Pu’er 熟普
Ripe Pu’er takes a shortcut that raw Pu’er doesn’t.
The 渥堆 (wo dui) fermentation process changes the tea substantially before we even begin talking about decades of storage.
That’s why young shou isn’t normally placed alongside young sheng on the cooling side.
Ripe Pu’er generally sits around neutral-warming to warming.
Age can still do wonderful things to it. Some of the fermentation character can recede, and the liquor can become smoother and more integrated.
But it isn’t following the same journey as sheng.
Young sheng may have a long way to travel.
Shou starts much further down the road.
Dark Tea / Hei Cha 黑茶
Hei Cha is another category that is easy to oversimplify.
There are many regional styles and production methods, so putting every Hei Cha into one box isn’t particularly helpful.
Still, broadly speaking, post-fermented dark teas tend to sit around neutral to warming in the traditional framework.
With age, they generally become more mellow rather than moving through the dramatic cooling-to-neutral transition of young sheng.
And ripe Pu’er shouldn’t simply be treated as another word for Hei Cha. They are useful to discuss separately.
So where does everything sit?
If I had to picture the eight categories on one line, I’d roughly imagine:
COOLER
Fresh Green Tea
↓
Young Raw Pu’er
↓
Fresh White Tea
↓
Yellow Tea
↓
Light Oolong
↓
Aged White Tea / Aged Sheng
↓
Traditional Oolong
↓
Roasted Yancha
↓
Hong Cha
↓
Hei Cha / Ripe Pu’er
WARMER
There will be overlaps everywhere.
That’s fine.
Tea doesn’t need to fit perfectly into a chart.
Age matters — but only for the right teas
This is probably the main thing I took away from looking into this.
Saying that “old tea is warming” is too simplistic.
Green tea doesn’t suddenly become a wonderful warming tea because we forgot about it in a cupboard for fifteen years.
With oolong, roasting may matter more than age.
Hong Cha already starts on the warming side.
But white tea and raw Pu’er are different.
With these two, age can meaningfully change where we place the tea.
And with raw Pu’er in particular, I would add one more word:
storage.
A twenty-year-old tea isn’t simply twenty years old.
It is twenty years of wherever it has been.
Temperature, humidity and storage conditions have all had twenty years to work on those leaves.
That makes a much better question than simply asking:
“Is this type of tea cooling or warming?”
I would ask:
What tea is it? How was it processed? How old is it? And how was it stored?
Only then does the answer start becoming interesting.
Related tastings
For examples in the cup, try these sessions. They describe individual teas rather than controlled comparisons of age or proof of warming and cooling effects.
- Bai Hao Yin Zhen 白毫银针 — Specks of Clouds in a Citrus Garden — Fresh white tea: a 2025 Silver Needle session.
- 2010 Fuding Bai Mudan (白牡丹) — A Single Drop of Gentleness — Aged white tea: a 2010 Bai Mudan session.
- A Walk Through an Ancient Forest — 2008 Dayi 7542 (大益7542·2008年) — Aged raw Pu’er: a 2008 Dayi 7542 session.
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