Calculating total number of VISIBLE checked (=TRUE) boxes in a range

I have a range of cells containing checkboxes that are manually ticked based on criteria met and applied to a total value calculation (TVC).The current formula =countifs(C16:16,TRUE) worked for what I needed at the time, but I need to alter it so that when I hide older cells, say C16 through C50 those checked boxes no longer become counted towards the TVC. I've tried =subtotal but haven't had luck because I'm not dealing with direct numbers. Any suggestions would be great.