In keeping with the sublime teaching of the Buddha, the practice of Namaskara was acculturated among all strata of society in countries wherever the Buddha Dhamma took root. Namaskara is an entrenched daily practice of honoring one another as respect-worthy fellow human beings.
So for well over 2,550 years, since the time of the Buddha, Namaskara has been widely practiced by Dhammaputris and Dhammaputras (daughters and sons respectively of the Sublime Dhamma) in daily life. The humane practice was ingrained in them from a young age and thus became second nature as they grew up.