“You can't teach an old dog new tricks” is a saying:

a) that recent scientific experiments have shown to be true for older people.
b) that only applies to dogs, cats and other non-human species.
c) that is outdated and scientifically incorrect.

Older adults are perfectly capable of learning new skills—from computer programs to foreign languages. In addition, studies have found that older adults enrolled in learning institutions do as well overall as their younger counterparts.