Partial Retirement

My advice as someone who did what you are doing a couple if years ago (what I'd tell my slightly younger self) is put the part-time wage in a savings account.
And use those couple of days a week to find/practise/develop hobbies (art least I did this bit)
Enjoy

I can't understand why pensions and Retirement can't be phased in gently for everyone .
Working a day less each week from age 60 and operating like a job share with someone starting working life. They earn a wage for that day and you get the equivalent of benefit .It would ease everybody in and out of work gently ,and act as a great reference for job seekers

There is a lot more to life than work (and kids.) Now you have a chance to live it. Nothing to be scared about and don't give too much to the kids as you will need it to enjoy your deserved retirement. If you want to help them pay for them to do things with you, which will give you all enjoyment and good memories.

I was forced to retire early on ill-health grounds and as an academic found my brain going to mush after 3 months, especially as I felt I could still work but not at the pace I was doing. I began working from home, doing work associated with what I had done all my life, but not under the stressful deadlines imposed by the faceless organisation. Without that outlet I would have gone mad - so my advice to you is much like that of other contributors - take the incremental route to retirement, get a proper work/life balance back again, but keep an open mind. It may be that when you do retire completely, you still want a little something in your life and you may even consider taking up a new and different paid job a couple of days a week, or doing some voluntary work.