If I take it serious I think for most of us it is true what Smokey the Elder said. We don't do most things with the concentration they deserve. We have x things in our mind and try to keep up with all of them. This was different when we were younger.

However I am also afraid what could happen if we belonged to some of the people who will be dement in their age -there are many of them. My mom (82 years) isn't -she is still very clever and does not forget more things than me- but my mother-in-law who died at 92 years had no idea who anybody was in the last years.