Task: Translation
Input (Japanese): 男の子だけは歳を重ねるにつれて「最近」その行為をしたと報告する傾向が高いが、自慰行為の割合は男女共に加齢とともに上昇した。
Output (English): Masturbation rates for both genders increased along with age, though only boys were more likely to report having "recently" engaged in the activity as they grew older.