

Mein Opa ist achtzig Jahre alt.
[ˈmaɪ̯n ˈoːpaː ˈɪst ˈaxtsɪç ˈjaːrə ˈalt.]
My grandpa is eighty years old.
Wie alt bist du?
[ˈviː ˈalt ˈbɪst ˈduː?]
How old are you?
Unser Auto ist schon sehr alt.
[ˈʊnzɐ ˈaʊ̯to ˈɪst ˈʃoːn ˈzeːɐ̯ ˈalt.]
Our car is already very old.
"alt" is in the lesson "Adjectives 2" (Level 4), along with 17 other useful words. LinDuo has 180 topic lessons like this one, 2,375 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.