
der Opa
grandpa
A colloquial and familiar term for the grandfather, that is, the father of one's own father or mother.
Jeden Sonntag gehen wir meinen Opa besuchen.
Every Sunday we go to visit my grandpa.
grandpa
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grandpa
A colloquial and familiar term for the grandfather, that is, the father of one's own father or mother.
Jeden Sonntag gehen wir meinen Opa besuchen.
Every Sunday we go to visit my grandpa.

old man
An informal, often affectionate, but sometimes slightly disrespectful term for any old man.
Der nette Opa von gegenüber hat uns mit dem Rasenmähen geholfen.
The nice old man from across the street helped us mow the lawn.
'Opa' (grandpa) is a simplified, childlike form of 'Großpapa' (grandfather). Similar to 'Papa' (dad/father) or 'Mama' (mom/mother), it belongs to familiar family language.
Als Kind habe ich die Ferien immer bei Opa und Oma verbracht.
As a child, I always spent the holidays with Grandpa and Grandma.
'Opa' (grandpa) is a colloquial and emotional word. In formal situations or in an official text, you would use 'Großvater' (grandfather) instead.
Mein Opa erzählt immer die besten Geschichten von früher.
My grandpa always tells the best stories from the old days.
You can often tell from the article whether someone's own grandfather or a strange old man is meant. Possessive pronouns like 'mein Opa' (my grandpa) or 'ihr Opa' (her/their grandpa) usually refer to the relative. 'Der Opa' (the old man/grandpa) or 'ein Opa' (an old man/a grandpa) often refers to an unknown older man.
Mein Opa hat mir das Fahrradfahren beigebracht.
My grandpa taught me how to ride a bike.
grandfather
„Opa“ and „Großvater“ can both refer to the father of one of a person's parents. „Opa“ sounds familiar and colloquial, while „Großvater“ sounds more neutral or formal. „Opa“ is often appropriate in family conversations, while „Großvater“ is more likely in an official context.

Am Sonntag besuche ich meinen Opa im Nachbardorf.
On Sunday, I am visiting my grandpa in the neighboring village.
Im Formular trage ich den Geburtsort meines Großvaters ein.
I enter my grandfather's place of birth on the form.