Chinese phrase
〜多大算〜？ 〜 duō dà suàn 〜
Meaning
How old does ___ have to be to count as ___?
When to use it
Asks what age qualifies someone for a certain category. It is a neutral way to ask where an age boundary lies.
Example dialogue
在中国多大算老年人？ zài zhōng guó duō dà suàn lǎo nián rén
In China, how old does someone have to be to be considered elderly?
一般来说，六十五岁以上算老年人。 yì bān lái shuō liù shí wǔ suì yǐ shàng suàn lǎo nián rén
Generally, people aged 65 and over are considered elderly.