知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业. My question is, is it formal or informal to use y/o as an abbreviation of years old in british english? This is my first question on this site.
Yo Gotti's brother shot dead outside restaurant as second victim fights
I am not a native speaker.
