Is the temperature of a normal healthy old man is less than that of a normal healthy young man?

The correct answer is no.

Explanation:

The temperature of a person changes depending on their age, the physical activity they are doing and until the time of day.

There is an established average temperature that is 98.6 ° F (37 ° C) as a healthy temperature.

If the temperature exceeds 100.4 ° F (38 ° C) it means that you may be ill or have an infection.

The difference in temperature by age is very minimal, but it is still a difference. Let's see:

Babies and children: from 97.9 ° F (36.6 ° C) to 99 ° F (37.2 ° C). Adults: from 97 ° F (36.1 ° C) to 99 ° F (37.2 ° C). Adults over age 65: 98.6 ° F (36.2 ° C).