FinalRow command

I am using this code:

FinalRow = Cells(65536,1).End(xlUp).Row

to find the final row.
Now I want to hide rows 7 through the final row.
I tried this:

Rows("7:FinalRow").Select
Selection.EntireRow.Hidden = True

Those commands work if I specify any number instead of FinalRow, but I don't know how many lines there will be. Any help?

Thanks for the note. Someone said that before, but I didn't understand what they meant.

Thanks!

I also tried

Rows("7:"FinalRow"").Select

That didn't work either.