Correct

年轻 vs 年青

/ niánqīng vs niánqīng /
Strokes

Definition

年轻 and 年青 both are Adjectives, which means [young].

Example

年青 refers to an absolute age, while 年轻 refers to relative age. 年青 indicates the age group of teenagers and those in their twenties.
1
Niánqīngrén
年青人
  
,
ràng
de
qīngchūn
青春
gēng
měi
美丽
  

Young,man,wish your youth more splendid!

2
xiǎng
想起
le
niánqīng
年青
shí
chàng
de
shǒu
  

It remind me of a song I used to sing when I was young.

年轻 indicates a relative age and can be used to compare age for the younger or the older.
3
Lǎowáng
老王
de
háizi
孩子
shí
十五
suì
  
,
lǎozhāng
老张
de
háizi
孩子
shí
十八
suì
  
,
lǎowáng
老王
de
háizi
孩子
lǎozhāng
老张
de
háizi
孩子
niánqīng
年轻
sān
suì
  

Lao Wang's child is 15, while Lao Zhang's child is 18. Lao Wang's is 3 years younger than Lao Zhang's.

4
Lǎowáng
老王
liùshí
六十
suì
  
,
lǎozhāng
老张
liùshí
六十五
suì
  
,
lǎowáng
老王
lǎozhāng
老张
niánqīng
年轻
suì
  

Lao Wang is 60, while Lao Zhang is 65. Lao Wang is 5 years younger than Lao Zhang.

5
shì
zhège
这个
guójiā
国家
zuì
niánqīng
年轻
de
zǒngtǒng
总统
  

He is the youngest president of the country.