It can be difficult. I’m retired. One thing I found out from friends looking for work is that employers are being crazy strict about seeing transcripts, references from previous jobs, etc. I haven’t had to pull a transcript in 30 years, and my previous employer won’t give references - all you can do is provide an HR number to get title, length of employment, and final salary. Also, a lot of people are being offered jobs lower in status and pay than the job they retired from.
And finally, lots of older workers just aren’t happy with the changes to the work place and the attitudes of some younger workers. A lot of people were probably thinking about retiring, and then when Covid lockdowns came along it gave them the excuse to pull the trigger and do it.