I was 57 when I retired, although I did some very part-time consultancy work until my SP kicked in at 66. My husband retired at 60, and had already had a year at home before I got sick of getting up in the dark whilst he was still in bed and decided to join him.
We haven't travelled - I'm never sure why that is the Holy Grail for so many - but I took another MA (purely for interest in the subject) and have taken a number of other courses, as that's what I enjoy doing. I have set up interest groups locally, and been involved in campaigning for causes dear to me. I have expanded my social circle a lot, which matters to me, as much of my pre-retirement socialising was connected to my work and I didn't want to find myself isolated if anything happened to my husband. We've also gone through the house and done our best to future proof what we can - more in the sense of making it ready to sell quickly if necessary, and pleasant to spend time in than installing stairlifts or whatever - which we never seemed to have time to do when we were working.
We are lucky in that we both have final salary pensions. Mine is small for various reasons, but my husband's is better, and he's happy to share. I realise that being able to retire early is a luxury (although it was only three years ahead of what I expected to be able to do before the SPA was changed, and when generations of women before me retired). Obviously it meant a financial hit, but I don't regret it at all. Conditions in the HE sector have been declining for years, and since Brexit have nosedived. I very quickly got used to filling my days, and having time to spend on hobbies and interests, but the best thing of all is not having to set the alarm and being able to stay asleep in the morning if I can. I wake a lot through the night, and knowing an alarm will go off soon is brutal.