boys will be boys
- It is hard, often fruitless, to attempt to curb the natural playfulness and tendency to mischief of most growing boys.
- Even grown men usually remain somewhat boyish at heart.
- "Boys will be boys," grinned Grandpa as he watched his adult son playing with the fancy train-set he had given his grandson for Christmas.
boys are mischievous by nature
men remain boyish at heart