You also can't flick a switch and stop working all of a sudden.
Not coming in hot for an argument here btw.. my uncle was the same as Des he retired a year or so ago after painting the house and doing a million odd jobs and walking 10 plus miles a day he found himself back working after 2 months, although part time on an ad hoc basis he swears to this day he would much rather be working full time than semi retired.
Is there a way you can balance work hours with more time for the family?