I think you're going to love retirement. I've been working at it a long time (over 15 years) and can say with some certainty it's far more hassle free than working 60 to 80 hours a week. My situation was just about the opposite of yours. I was 57 when I walked away from it all, and have enjoyed being retired as much if not more than working. I loved my job and enjoyed going to work each and every day. Each day was a challenge, but in a good way. Engineering was downsizing, and buyouts were available for those with enough time with the company.
The downsizing was due to the fact that the "new" management didn't want to continue to follow the same path as previous managers. Over a 50 year period the company had developed outstanding research and engineering organizations. Between them they developed hundreds of new products and the processing and packaging machinery to put them into the market place. The new generation of management saw those organizations as overhead, and expenses they could eliminate.
Rather than develop new products from scratch they thought it would be easier and less expensive to copy and improve on those made by others. Rather than design and build efficient and innovative machinery it would be easier and less expensive to contract an outside firm to do the work. That way they would only have engineering expense when a new product came along. Theoretically if there were no new products in the pipeline they wouldn't need new processes or equipment, and they could replace existing inhouse built machinery with less expensive although less durable and less efficient commercially available equipment.
The ideas looked like winners on paper, but the practicality of the situation was much different. Contracting with outside firms to design and build new machines raised the cost over 6 times what was being spent to do it inhouse. When they couldn't handle that expense they went the commercial route. Then they were purchasing machines that required 40% more labor to operate, needed triple the dollars in repair and replacement parts, and had an overall lifespan of less than half the inhouse built machines they replaced.
With the research and engineering departments decimated they had more or less sealed their fate. Rather than be a world leaders and innovators they've chosen to be followers. Income and profits aren't what they were, and it gets harder each day to attract people to a run of the mill company.