Why do people relate intelligence with age? People do not get smarter the older they get, quite often the opposite as IQ tends to decrease with age. There are 3 year olds that are smarter then adults, and vice-versa. There are genius 3 year olds and stupid 3 year olds.
What is really being said is that people without preconceived notions of how computer interfaces work will get used to a completely new interface standard than people who have been using a completely different format for the past 15 years, which I would have considered completely obvious. It would be the same with people transitioning from QWERTY to Dvorak as opposed to those with no typing experience, those without experience would get used to Dvorak much faster.