> your ability to execute a task that you were used to executing before is reduced due to the ageing process

> your full speed to work goes down

> your lower efficiency

Do you have sources on this? On its surface, it sounds like fairly ageist thinking. I'm not young, but I don't feel like I've slowed down at all. In fact, my experience keeps me from making as many mistakes as when I was younger.

I know folks, considerably older than I, who are faster still at the things with which they have experience, and quick to pick up new things, too.