AgGrid: Changing the Aggregation Header Name

Now I have a column eg name is "age"

    {headerName: 'age', field: 'age', filter: 'agNumberColumnFilter', aggFunc: 'sum'}

I add a sum aggFunc on it, so the result of header name is changed to "sum(age)"

However, I still want to show "age", how can I implement this?

Thank you very much