人体随着衰老产生的特殊气味源于皮肤脂质的化学变化。皮肤中的脂肪酸会随年龄氧化分解，释放出2-壬醛这一化学物质，这是导致"老人味"的主要原因1。一项2001年的日本研究首次在40岁时检测到了这种物质的出现1。
有趣的是，尽管2-壬醛确实会随年龄增长而产生，但公众对老年人气味的实际感受可能存在认知偏差。在2012年的一项研究中，41名年轻人评估了来自三个不同年龄段的衣物样本，结果发现老年人的气味"被评为强度较低、令人不适程度较低"1。
在日常护理方面，定期洗澡可以清洗掉部分气味，但仅用肥皂和清水无法完全清除2-壬醛1。为了减缓这一现象，专家建议通过增加抗氧化物的摄入来应对，包括食用彩色水果蔬菜以及含有维生素C和E的食物1。同时，戒烟和保护皮肤免受阳光伤害也是有益的抗氧化习惯1。
The distinctive odor associated with aging stems from chemical changes in the skin rather than poor hygiene. As people grow older, fatty acids in skin lipids undergo oxidation and decomposition, releasing a compound called 2-nonenal, which is primarily responsible for what is commonly termed "old person smell."1 A 2001 Japanese study first detected 2-nonenal at approximately age 40, marking the point at which this odor typically begins to emerge.1
Contrary to popular perception, research suggests the odor may be less objectionable than commonly assumed. In a 2012 study, 41 young adults evaluated clothing samples from three different age groups and rated the scent from older individuals as having "lower intensity and lower unpleasantness" compared to other age groups.1 While regular bathing can reduce some of the odor through partial removal, soap and water cannot completely eliminate 2-nonenal from the skin.1
To minimize age-related odor, experts recommend adopting antioxidant-rich habits, including consuming colorful fruits and vegetables high in vitamins C and E.1 Additionally, avoiding smoking and protecting skin from sun damage are beneficial antioxidant practices that may help slow the oxidative processes responsible for the compound's formation.1
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