noun
Familiar, affectionate term for one's own grandfather or an elderly man addressed as such. Often used by children or within the family.
See also: じいさん
じいちゃんは毎朝散歩に行く。
Grandpa goes for a walk every morning.
夏休みにじいちゃんの家に遊びに行った。
I went to visit Grandpa's house during summer vacation.
noun
old man; elderly gentleman
Used to refer to an elderly man in a friendly, informal way, not necessarily a relative. Similar to おじいさん but more casual.
See also: じいさん
公園で知らないじいちゃんに話しかけられた。
An old man I didn't know spoke to me in the park.
Contraction of じいさん (old man/grandfather) with the affectionate suffix ちゃん. The reading じいちゃん is standard; variants like じーちゃん are informal elongations.