1. Says who?
2. Measured how?
3.Over what time span?
4. Compared to who and when?
5. Happier or more hedonistic and immature?
6. Who funded the "research"?
7. Lies, damned lies and statistics
8. One phrase: "replication crisis"
9. Meaning and happiness are not the same thing but the former trumps the latter.
10. Responsibility and happiness are not the same thing but the former trumps the latter.
11. Adventure and happiness are not the same thing but the former trumps the latter.
If social or educational psychologists conducted the study, ignore it.
If people who hate children or do not have them conducted the study, dismiss it.
Take note @BasedMikeLee
"There is only one corner of the universe you can be certain of improving, and that's your own self."
Aldous Huxley
It's you. Everything you do matters.