Beginner question: Nightly flow to increment column by 1

[JessTob123]

I'm such a self-teaching beginner, so this is surely an easy one. I have a column 'Age' (number) that starts at 0 when a new item is created.  Each workday, I want to run a flow that will increment each value by 1.    

The flow errors saying I'm passing a string, not a number.  But I can't reference the 'Age' column without the quotes.  I'm hoping some kind member can help me get through this most simple one.  😕 

(Obvi, training pointers welcome)

[NickMerrick]

instead of 'Age' in an expression its going to be 

items('Apply_to_each')['Age']

you also don't have to type this manually, as once you have started writing an expression, you can click over to dynamic content and select the value you want in the expression. This doesn't really seem needed though as every record contains a created date and if you ever need to find data X days old you could find them using current date and created date, finding the difference.

[JessTob123]

Thanks - let me give some bigger context.  I have a list of requests.   I'd like to be able to track how old requests are to check our SLA with requestors.  Ideally date math could just do this except that I don't want to count weekends so an item that comes in Friday night is not 3 days old on Monday morning.

We have a 'created' column, and you'd think you could just DATEDIFF these (for workdays) in the 'Age' field, but I cannot figure out date math. 

So I created an Age field, default it to 0 or -1 (depending on the time of day, so end of day requests don't 'count' - another fun one) and then run a scheduled flow to increment this value daily.

It's clunky but I cannnot figure out how to track age of requests in any smoother manner.

[JessTob123]

Thank you again, Nick.   For some reason 'Age' isn't showing up in the dynamic content options.  Surely that's the crux of my issue....

[NickMerrick]

if you look in SharePoint list settings you can click the age column, if you look up at the URL it will show the actual name of the column, that might be what you are looking for. but there are methods for excluding weekends and holidays, see link below

https://www.penthara.com/how-to-dynamically-calculate-working-business-days-for-a-due-date-in-power-...

instead of due date, just input current date, this would return business dats between creation and current date.