Well, I may not be a spring chicken, but I got some spizzerinktum left

I am a spring chicken, but I lie about my age to get served in bars.

Your little brother is a spring chicken.

"Grandma, Why don't you ever wear shorts? It's hot out for God's sake."
"What do I look like to you, a spring chicken?!"

This outfit make me look like a total slut. I wouldn't go that far, but you do look like a spring chicken.