an old man
an old house
We're all getting older.
I was shocked by how old he looked.
I'm too old to be out dancing every night.
That's an old joke - I've heard it about a thousand times.
Wroctaw is [an] old town. (Skills for Life (Entry 1); A1; Polish)
How old is your father?
Rosie's six years old now.
He's a couple of years older than me.
She is 23 years old. (Skills for Life (Entry 1); A1; German)
I saw my old English teacher last time I went home.
He bought me a fancy new camera to replace my old one.
She showed me her old school.
My old one is [a] Nokia. (Key English Test; A2; Turkish)
I saw an old friend who I went to high school with.
Do you remember my old friend Jack? (Key English Test; A2; Thai)
This place isn't as good as it was in the old days.
In the old days, a scholar could spend years of his life in search of specific information, which now can be easily and inexpensi[ve]ly found at the click of a button! (Certificate in Advanced English; C1; Greek)