The fact (that) he's older than me is notrelevant.
他比我年纪大这一事实无关紧要。
《牛津词典》
2
The three-stage life of full-time education, followed by continuous work, and then complete retirement may have worked for our parents or even grandparents, but it is notrelevant today.
The second hypothesis is that we do perceive everything, but the brain categorizes the information, and whatever is notrelevant to what we are concentrating on gets treated as low priority.