Over the hill

“Over the hill” is a pretty common idiom in the English language, and we use it to describe someone considered to be past their prime, mostly in terms of age. It’s a statement that says, “Hey, you’ve reached a point in your life where you’re no longer young or energetic.”
What Is Over the Hill? – Idio…
grammarist.com
The phrase “ over the hill ” is an idiom used to describe someone who is past their prime, typically referring to someone who is getting older and is no longer considered young or at the peak of their abilities.
"Over The Hill" Meaning, Orig…

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A sexy divorcie falls for an over-the-hill cowboy who is struggling to maintain his romantically independent lifestyle in early-sixties Nevada.
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informal
old and past one's prime:
"a once famous ballerina, now over the hill"
Similar:
long in the tooth
as old as the hills
elderly
old
aged
senior
ancient
venerable
decrepit
doddering
doddery
senescent
past one's prime
not as young as one was

Translate over the hill to

German
ueber den Huegel