NRTFT, but have to say OP, that your ideas of how to fill your days without work seem to show a remarkable lack of imagination. Gardening, walks, coffee?
Can you really envisage no more fulfilling way to spend your days? You surely have some interests beyond work that you'd like to pursue, no?
As so many PPs on this thread have shown, life can be busy and more interesting than ever when you don't have work to get in the way and spoil things.
I stopped work in my early 50s, because it's my firm belief that the modern pattern and pressures of work are not suitable for every human - we're not all well-disposed for the rat race, and I certainly wasn't.
Since stopping, on a modest work-place pension with no partner to support me, I've chosen poor but happy over the misery of work.
I'm now at state pension age but in the intervening years I've made more new friends than I did in the rest of my lifetime put together, and not all of a similar age to me, or even retirees. But they are all a diverse bunch of "interested and interesting" people. I do four sports a week, two of them just started in the last year. I have done a degree, completed several FutureLearn courses and learned four languages. I have learned to play six musical instruments, again some in just the last couple of years, I play and sing in two bands - am very excited to be playing in my first festival shortly - and I sing in two choirs. I have researched my family tree and am working on family trees for three others. I am politically active, and am secretary of a local group, running a monthly stall and organising leafletting campaigns and other activities. I don't watch TV, I can't even think of the last time I sat on my sofa. When at home, life is spent in front of my computer researching, gaming, planning, learning, writing reports etc.
I have spent more time (and money) going to the theatre or music and comedy gigs than I ever had the energy for before, and consider myself to be more culturally knowledgeable than at any stage in my past.
Healthwise I am fortunate to be doing well, but I don't take this for granted. My sister died in her forties, I am currently the same age my father was when he died, and I am well aware that a long healthy future is not guaranteed. I have lost 4 stone through hard work over the last three years - I have a waist again! In my 60s! - but though this helps, I choose to live every day as if it were my last.
I've learned a new expression on this thread - boring people are bored. This could be true, as could the reverse - bored people are boring. But life is what you make it, they say, and I'd like to think I've managed to make my life anything but boring.
You, OP?
~Damn, I just name-changed, but I 'm going to have to do it again now!