All climbers should have a medical check prior to attempting the mountain. Ask your doctor if high altitude trekking is permissible for your age, fitness level and health condition. Ask if you have any preexisting medical conditions that can cause problems on the climb. Ask if any of your medications can affect altitude acclimatization. Ask whether Diamox can be taken with your existing prescription medicines.
The minimum age for climbing Mount Kilimanjaro is 10 years old. There is no maximum age. However, the climb is strenuous and presents health risks, especially to people in high risk categories. Serious consideration should be given to anyone under the age of 18 and over the age of 60. The climbers on the extreme ends of the age spectrum should definitely consult their doctor.
What about Altitude Sickness?
Altitude sickness is potentially fatal. However, most climbers will get some form of mild acute mountain sickness (AMS) while on the mountain. Your guide will monitor you closely during the duration of you climb. However, you should be aware of the symptoms of mild, moderate and severe AMS, and you must inform your guide of any symptoms immediately. Never try to hide your symptoms in order to continue climbing. There is always the possibly you will not be able to summit due to AMS.