I am 66 soon to be 67. I got my Medicare at 65 and that saved me $1500 a month because I am self employed and self insured. Then I got my Aerospace retirement check the following month so I had supplemental income. Then, when I turned 66 (full retirement age for me) I started SS and because I was a sole proprietor for over 30 years and paid a lot into it, I draw a decent check. I get no penalty for continuing to work at my shop. I do recommend waiting for full retirement age for the main bread winner of the household. I like my shop and the work I do and I get paid well for my services, plus I have a place for all my bicycles! I can take off for a lunch ride to the harbor a couple of times week . I sold my CNC machines to make room because I don’t want production work anymore, just custom tooling. Some of my customers thought I was going into the bicycle business when they saw the bike racks going in.