since his first climb up a bolivian andean peak in 1974 , he has reached the summit of the 6 , 642-meter -lrb- 21 , 791-feet -rrb- -high illimani 170 times and the 7 , 000-meter -lrb- 22 , 965-feet -rrb- -high aconcagua , latin america 's highest mountain , three times .