this proportion is increasing over time.
4
In a
study of 1,416 US travelers attending a pre-travel
clinic, 48% were >50 years of age, one third were
>60 years, and almost 1.5% were>80 years of age.
2
Because of their greater difficulty in acclimatizing
during travel, adjusting to extreme climatic conditions
(temperature, humidity, and altitude), their greater
predisposition for contracting certain diseases, their
increased probability of underlying medical conditions