Gestation lasts 14-15 months. Births occur May-September in Northern Hemisphere, November-March in Southern Hemisphere. Single young is produced every 3-6 years. Young are weaned in about 1.5-3.5 years, though young may continue to nurse for several years. Females sexually mature at 7-11 years; pregnancy rate gradually declines after age 14. Males may not breed until about 25 years old. May up to at least 60-70 years.