In 1993-94, there was another Castle Cup/Total Power Series double for Orange Free State. In international cricket, he was named as vice-captain for the tour of Australia despite being the youngest member of the squad. In the first ODI of the triangular tournament with New Zealand and Australia, he guided South Africa to victory against Australia at the MCG with 91*, which won him the man of the match award. He scored 71 in a rain-affected first test at Melbourne before a tense second test that South Africa won by 5 runs. An injury to captain Kepler Wessels meant Cronje was captain for the final day of the match. Between the second and third tests, the one-day tournament continued, now with Cronje as captain, South Africa made the final series but lost it 2-1 to Australia. He became South Africa's second youngest Test captain, after Murray Bisset in 1898-99, when he led the team for the third test at Adelaide but it was an unsuccessful start to his captaincy career as the series was squared.  In February 1994, there was the return series as Australia toured South Africa. Cronje started the ODI series with scores of 112, 97, 45 and 50* and when Australia played Orange Free State in their final match before the first Test, Cronje hit 251 off 306 balls, 200 of these came on the final day in which 294 runs were added. Despite this, Orange Free State lost the match. In the first test at Johannesburg, he added another century as South Africa won by 197 runs. This innings was the end of a 14-day period in which he'd scored 721 runs against the Aussies. However, he failed to reach fifty in the next two tests and four ODIs as both series were drawn.  There was another drawn series when South Africa toured England in 1994. Cronje scored only one century on the whole tour and scored only 90 runs in the three-test series. In October 1994, South Africa again came up against Australia in a triangular one day series also featuring Pakistan. Cronje scored 354 runs at an average of 88.50. Despite this, South Africa lost all their matches. This series was Bob Woolmer's first as coach and Kepler Wessels' last as captain. Cronje, who'd previously been vice-captain, was named as captain for the test series with New Zealand in 1994-95.

Answer this question "how old was he when he was stand in captain?" by extracting the answer from the text above.