One tip for retirement....
You need to be very careful who you talk to about it.
If you have a doctor or a dentist or anybody you like it is critical that you act unhappy when they ask you about retirement....
because you do not want them to retire.
(I love retirement but let that be our little secret. :-) )
Finally retired at 72...I'm 80 now.
I work more hours on my history projects than when I was working my regular job which was both mentally and physically grueling.
Secret...I understand. ;-)