I took voluntary redundancy a year ago when I was 59. I had become very disillusioned in my job and hated going every day also, I was working with a very depressed, pessimistic woman who dragged everyone down every day. So she tipped the balance when the notice went round for volunteers to go. The relief was profound when I made that final decision and I haven't regretted it.
I felt a bit guilty at first, as I thought I still had six years to go before I can receive my state pension and I should probably still be working but my DH is happy I'm retired with him now, he's 9 years older. We manage on his pension and a pension I got from a previous job, we are careful but not frugal and we're doing ok.
Life is good, we can go off with the caravan any time, I can visit DD and DGC whenever I like (or am needed). DH goes fishing so I still have time to myself for my pursuits and we're not in each other's pockets. I think you do need interests both together and separate if you're not going to end up watching 'Homes Under the Hammer' etc all day. Certainly re-train if you want to, that in itself will help make you feel rejuvenated.
I would say if your finances permit it, go for it, you will be glad you did it, especially on cold, wet, dark mornings when you wake up at 7am, smile and turn over for that extra hour in bed
Good luck!