I was a manager at a college and got out at 60 (year ago) - a change of senior management, changing government policies and an inability to see that recruiting 16+ students was going to get very competitive as the cohort shrank did influence me.
I find that my time goes quicker in retirement than at work. I have plenty to do , DIY ( a lot on 2 son's houses), gardening properly and constructing the 5m. x 2m layout in the garage.
I had done consultancy work and was an OFSTED inspector (boo!, hiss!) but I've let it all go.
My decision was influenced by my father who died the year he retired.
What is embarrassing is when I meet colleagues whose first words are "you look well", then "you got out at the right time" redundancies, increased workloads etc. etc.
You will need some financial planning but this can be helped by having time to find the best utility supplier, travel, car and house insurance, banking, savings and so on.
I didn't ease down at all in my last year;that's not professional and would not have helped my under-managers.
What did surprise me was this group for advice and help, freindliness of traders and model shops and exhibitions, a really useful fraternity.
No, I wouldn't go back. Look on it not as retirement, but your next career, the portugese word for retirement (reforma?) suggests replanning your life which is what it should be;
not "en retrait" as the french say.
Good luck and enjoy yourself!