I'm approaching mid-forties. As a former Buddhist (up to like the age of 13) turned atheist, I find all the points the author shared in this PDF agreeable.

Being self-reliant (being able to find happiness even when alone); being self-aware; being aware of others (including others' feelings, motives, perspectives); focusing on the journey; acknowledging that 'luck' has a non-negligible role in one's life; preparing our minds for inevitable death with calm acceptance; so many things the author's view resounded with in my opinion and experience.