Galle [Sri Lanka], February 2 (ANI): Australia's stand-in skipper Steve Smith backed veteran opener Usman Khawaja to continue with the Test side as long as possible, saying that he is batting well and "age is just a number."A dominant performance with the bat against Sri Lanka in Galle has left Australia with plenty of ponder ahead of the World Test Championship Final. Smith is backing in-form batter Usman Khawaja to prol
