Although it is quite unheard of, some people may experience mild symptoms of altitude sickness with trivial headache that is not considered to be a great risk factor. As long as a person is physically fit and can walk several ups and downs, we recommend this trek for all age groups including families, children or senior citizens. Hikers usually begin experiencing altitude sickness at an altitude between 3,000m (9,842ft.) and 3,800m (12,467ft.) in the Everest region. It doesn’t mean that altitude sickness can’t hit you below this altitude. Some trekkers can get sick even below 3,000m (9,842ft.) while some may never experience any sort of discomforts even at 5,000m (16,404 ft.)