(idiomatic) used to show that the number previously mentioned is continuously changing, i.e. increasing or decreasing
There is a 1,700-year-old tea tree still living in southern China which is more than 100 feet tall and counting.
and counting phrase amount PHR
He just has drank 6 beers! six and counting. (six and he didn´t stop, he continues on...)
He has written 10 pages to his essay. 10 pages and counting. (...and he is still writting.)
In a general sense, "e a contagem/o número de cervejas, páginas etc está subindo!"