Nope.
There's no "think" involved.
The APA (American psychological association) has the stats to back it up. And socialized med countries (which have better statistical studies) back up their findings across the board (for once!).
Regardless of age: (the tech boom introduced a lot of 20-40yos in the 'retired' bracket, which researchers jumped on)
Most newly retired people are clinically depressed in 6 months, and retirement is a HUGE indicator for suicide, drug/alcohol addiction, & dementia.
Suicide & addiction are related to the depression (sunk or self medicating).
The DEMENTIA is key, though.
The brain is highly plastic.
Use it or lose it.
Even the brightest minds, retiring at their peak (no history of comcerning symptomology) are a gazillion (obviously made up number, Im not digging out the real number, but its a LOT) times more likely to be treated for dementia within 2-3 years. INCLUDING the 20/30/40yos.
Retirement is actually taught as something for doctors & nurses to flag a patient for psych consult in school (how I learned about this) because it is soooooooo highly predictive of
- depression
- dependence
- dementia
UNLESS...
The patient is leading an active life.
Meaning they're reading/ volunteering/ mentoring/ traveling/ ANYTHING that uses up at least half their time in mentally active pursuit concordant to or more rigorous than their previous work. (AKA: Former teacher watching grandchildren = not concerning. Former pilot watching grandchildren = concerning. Former accountant studying aeronautics for model planes = not concerning. Former aeronautics engineer with model planes = concerning. Because one is stepping up their maths, and the other is barely touching their maths. )