Difference between 余 and 多; the use of 岁 and 年 1. If I want to say &quot;more than a hundred years&quot;, which one is correct?
a. 百余年
b. 一百多年
One of the example in ichacha &quot;五十余年: fifty odd years&quot; makes me wonder why 余 is used instead of 多. So, when should we use 余 and 多?
2. In almost every online dictionary I've checked, aside from being classifier for age ('years old'), 岁 can also mean 'year'. Is there any example of it being used to say 'year' but not age?
Both are fine but there is a subtle difference. 

百余年 is rather formal and literary, and sounds like something from transcript of a documentary / speech / piece of writing. You would rarely say 百余年 in daily conversations. 

一百多年 can also be used in writing but people also use it in colloquial situations.