Spring chicken
informal
a young person; usually used in negative contexts to say someone is no longer young:
He's no spring chicken anymore.
Getting fit takes time and commitment and if you're no spring chicken, you have to take it easy along the way.
At 63 she's still a spring chicken compared to the other residents.

so-and-so
Noun
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Inf

devil-may-care
Adj
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happy-go-lucky
Adj
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freewheeling
Adj
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Inf

(As) ......
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As dull as ditchwater (or dishwater)
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As clear as mud
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"The computer manual was as clear as mud, so we stopped reading it."

As long as your arm
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Inf

As light as a feather
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As large as life
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As flat as a pancake
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As easy as pie/ABC/anything/falling off a log
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Inf

As clear as day
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As clear as a bell
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As blind as a bat
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As....as hell
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Inf

As deaf as a post
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Inf