older than 72

def older?(file)
  r = (Time.now - File.stat(file).mtime).to_i / 86400.0
  r >= 3 ? true : false
end

# general use

def older_than?(file, n)
  r = (Time.now - File.stat(file).mtime).to_i / 86400.0
  r >= n ? true : false
end