Wisdom of the Ages

Beche-la-mer of Two Cents left a contribution to the Wisdom of the Ages project, it reads:

Now that my 40th birthday is just around the corner, I am starting to wonder whether I will be grown up by the time it arrives. Though I usually feel grown up, I am sure I will look back at my 40-year-old self in a few years time and realise how immature I was(am).