Dallas, June 23 -- Lionel Messi has said that he is not thinking about his age after becoming the World Cup's all-time scorer two days shy of his 39th birthday.

Messi surpassed Miroslav Klose's record of 16 World Cup goals with a first-half strike in Argentina's 2-0 win over Austria in Dallas on Monday.

He added another goal in stoppage time to take his career tally in the tournament to 18 goals.

"I'm not spending time thinking about my age. I'm simply focused on being well," Messi told reporters.

"I feel physically good, and maybe that's why I'm playing better." Monday's result moved Argentina to the top of Group J with six points, three points clear of second-placed Austria.

With the reigning champion's progress to the round of 32 al...