老爺子

1. • my (your etc) old father
2. • polite appellation for an elderly male

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
• 爺(yé)grandpa
• 子(zi)noun suffix, as in 椅子 yǐzi "chair"