48岁时，他依然展现出青春和活力。

At 48, he still projects an image of youth and ___vitality.

他的不良行为常常被原谅，归咎于他孩子般的活力。

His bad behaviour was often excused, being blamed on his boyish ___vitality.

定期锻炼对于随着年龄增长保持活力至关重要。

Regular exercise is essential for maintaining one's ___vitality as they age.