It is because Prince Harry officially turned 30 last night. I was not invited to his party so I only heard it from the news this morning (not that I would have time anyway :>).
I should have discussed it before, but now is a good time to mention it.
The target audience of my book is people of 30 years old and beyond. That accounts for over 60% of the total population in the G10 countries. However, I think the book’s basic framework in approaching learning from 3 angles, namely psychological, practical and problem-preempting, is still applicable to learners of ALL ages :>