更年轻的英文表达可以用 "younger" 或 "more youthful"。
"Younger" 是形容词，意思是年龄比别人小或比过去更年轻。
"More youthful" 是形容词短语，意思是看上去年轻，有活力。
例句：
He looks younger than his actual age. 他看上去比实际年龄小。
She has a more youthful appearance than her sister. 她看上去比她姐姐年轻。
另外，还可以使用 "youthful" 这个形容词，意思是有年轻的气质或特征，如有弹性的皮肤或精力充沛。
例句：
She has a youthful energy that keeps her going all day. 她有一种年轻的能量，让她整天都精力充沛。
His skin is still youthful and smooth. 他的皮肤仍然有弹性并且光滑。
希望以上回答能帮到你！
"Younger" 是形容词，意思是年龄比别人小或比过去更年轻。
"More youthful" 是形容词短语，意思是看上去年轻，有活力。
例句：
He looks younger than his actual age. 他看上去比实际年龄小。
She has a more youthful appearance than her sister. 她看上去比她姐姐年轻。
另外，还可以使用 "youthful" 这个形容词，意思是有年轻的气质或特征，如有弹性的皮肤或精力充沛。
例句：
She has a youthful energy that keeps her going all day. 她有一种年轻的能量，让她整天都精力充沛。
His skin is still youthful and smooth. 他的皮肤仍然有弹性并且光滑。
希望以上回答能帮到你！