Did you forget why you went into the kitchen? It may be more location than age related. Researchers in Notre Dame conducted several experiments on rooms and their effect on memory. Subjects in the study were divided into two groups and given a simple task while traveling the same distance. The only difference is one group went through a doorway and the other did not.
They found that people who traveled through the doorway were three
times more likely to forget their task. Researchers concluded that
our mind perceives doorways as “event boundaries” and that decisions
you made in that room are “stored” there when you leave. That is
also why it is easier to remember if you go back into that room. That
presumes you remember which room you came from.