Aged Oolong (Lao Cha): What Happens When Oolong Grows Old

Aged oolong (老茶, lao cha, "old tea") is oolong kept for years, often decades, until it loses its fresh, floral character and turns soft, sweet, plummy and woody. Traditionally it's roasted before storage and re-roasted every year or every few years to drive off moisture and keep it clean. The best candidates are roasted, rolled oolongs such as traditional Tieguanyin, Dong Ding and Muzha Tieguanyin, plus Wuyi rock teas. Unlike pu-erh, oolong is aged sealed and dry. Brew it hot, at 90–95 °C, and be patient with it: this is a tea that has already waited years for you.

What happens as oolong ages#

Fresh oolong has bright floral or roasted notes. Give it years, and slow oxidation and chemical changes soften it: the flowers fade, the roast mellows, and deeper notes turn up, such as dried plum, dates, wood, herbs and sometimes camphor. The texture gets smoother and thicker, and bitterness all but retires.

A tart, plum-like note often appears as oolong absorbs a little moisture. In small amounts it's part of the charm; strong sourness is the tea asking for a re-roast.

Which oolongs age well#

More on roast in roasted vs green oolong.

Why aged oolong is re-roasted#

Even a sealed jar isn't sealed against time: oolong slowly absorbs moisture and can turn sour or flat. Traditionally, keepers re-roast it every year or every few years at a low temperature to dry it, clean up the taste and reset the aging. Each roast adds depth but also flattens the tea a little, so skilled roasters do it gently and only when needed. Some aged oolong is never re-roasted and is sold as "unroasted aged", with a brighter, tangier taste.

What it tastes like#

Aged oolong vs aged pu-erh and aged white tea#

More in aging pu-erh and aged white tea.

How to age oolong at home#

1. Choose a roasted, rolled oolong you already like.
2. Buy enough to taste it over the years; you'll open the jar more often than you plan to.
3. Store it sealed: a clean, airtight tin or jar, away from light, heat and smells.
4. Taste it once a year. If it turns noticeably sour, it needs re-roasting.
5. Re-roast carefully or ask a tea roaster; home ovens are very good at turning aged oolong into charcoal.

How to brew aged oolong#

A clay teapot holds heat and rounds out old tea. Aged oolong is very forgiving: it's had years to lose its temper, so long steeps rarely turn it bitter.

How to buy aged oolong#

• A trusted source: age is easy to fake, and a heavy roast can make a young tea look old.
• Year and origin stated, plus how often it was re-roasted.
• Clean aroma: plum and wood, not mustiness or burnt charcoal.
• Tasting a sample first is worth it.

Myths#

"Oolong goes bad after a year." Green oolongs fade, but roasted oolongs can age for decades.

"Sour means ruined." A slight tartness is normal; strong sourness means it needs re-roasting.

"Aged oolong is stored like pu-erh." Oolong is aged sealed and dry; it doesn't want the fresh air pu-erh enjoys.

My honest take#

Aged oolong is one of tea's quiet pleasures: less famous than aged pu-erh, often better value, and wonderfully soothing. Start with a sample of aged Tieguanyin or Dong Ding.

The bottom line#

Aged oolong is roasted oolong kept sealed for years and re-roasted when needed. It turns soft, plummy, woody and sweet. Choose roasted, rolled oolongs or rock teas, store them airtight, brew them hot, at 90–95 °C, and let time do the clever part. More in my oolong guide.