 <translate> The relevant information is: On March 23, 1971, a proposal to lower the voting age to 18 years was adopted by both houses of Congress and sent to the states for ratification. So, the answer is March 23 , 1971. <yor> Ìsọfúnni tó ṣe kókó ni pé: Ní March 23, 1971, àwọn ilé méjèèjì nínú Ilé Ìgbìmọ̀ Aṣòfin gbé àbá kan tó sọ pé kí wọ́n dín ọjọ́ orí tí wọ́n fi lè dìbò kù sí ọdún méjìdínlógún, wọ́n sì fi ránṣẹ́ sáwọn ìpínlẹ̀ láti fọwọ́ sí i. Nítorí náà, ìdáhùn náà ni March 23, 1971. 