[jerlam]

> Among those aged 25 to 44, a group we call “early adults"

A 40 year old is federally protected from age discrimination (for being too old) and can have children which are legally adults. No one is calling this age group "early adults".

[helpfulfrond]

The "we" in the article does not include you - it refers to the authors who are mortality researchers and looking to differentiate between different groups of adults.

[ompogUe]

I discriminate adulthood 2 ways:

"legal"/"federally protected" adulthood - 21 - can vote, drink, etc.

"biological" adulthood - brain is not fully developed until ~25, and takes a few years to "activate/realize" those "powers", so ~30 for "actual, mature" adult processes to start taking place. ~40 seems appropriate within that as an outer boundary of "early" adulthood.

[llbbdd]

It's an aside but age 25 being full development of the brain is a pop science myth