老牛吃嫩草

1. • lit. an old cow eats young grass (idiom)
2. • fig. a May-December relationship
3. • a romance where the man is significantly older than the woman

Character by character

• 老(lǎo)prefix used before the surname of a person or a numeral indicating the order of birth of the children in a family or to indicate affection or familiarity
• 牛(niú)surname Niu
• 吃(chī)eat
• 嫩(nèn)young and tender
• 草(cǎo)grass