Dog bites four or five years old are still at risk of developing the disease, but the likelihood is relatively low.
The duration of the incubation period for rabies is related to age, site of the wound, depth of the wound, amount and virulence of the invading virus, and other factors. The length of the incubation period is one of its characteristics. According to epidemiologic data, the incubation period time of rabies, about 30% within 30 days, 54% between 31-90 days, 15% more than 90 days, about 1% more than 1 year. So it is possible to develop the disease over 5 years, but it is less likely.
In addition, it is possible to find out if the dog that bit the person at the time is still alive or to observe how long it takes for it to die after the bite; if it is more than 10 days, there is generally no risk of rabies virus infection. The World Health Organization recognizes the “10-day watch method” as being globally applicable.
The questioner is advised to stay positive and lead a normal life, and not to panic.