Hmm, I think the mischevious/this will get me into trouble smile could use some improvement.
I remember when I was in my late 20s when a man about 70 or a little older had a little too much at a bar, looked at me then in a mirror. As he combed his hair back he said, "If I was only 15 years young..."
"Goodness, if you were 15 years younger you'd still be (too old)!" I thought to myself. Too funny.
(Not to mention, his wife was there.)