Things you wish you hadn't quit

[crazy canuck]

Anyone who regrets quitting something... why not pick it up again?

There are some things that are very difficult and perhaps impossible to pick up again with any degree of success.  There seem to be particular moments in time when one can train their body/mind to do certain things well and if those times are missed it is very difficult to pick up later.

This thread is a good example of those sorts of things.  Language acquisition and musical training seem to be most effective when learned at a young age. The skills necessary for some sports are almost impossible to pick up later in life for some reason.