for me when its time to walk,its time to walk no matter what,i dont suffer fools and the few jobs i have walked from over the years have had more than their fair share,think it depends on your line of work and how appealing you make yourself in that particular role to a future employer,experiance,qualifications whatever,im 43 now never been out of work in my life but then the work i do is quite specialist and a few certificates and years of experiance can make all the difference