No one likes his job every single minute. You are always going to have good days and bad days. Don't complain constantly - especially at work, but also in restaurants, on Facebook, at the gym... you could be overheard. And when someone asks you about your job: If overall you like it well enough, you say, "It's pretty good." And if it is terrible, say, "I'm learning a lot."
It never occurred to me that I would be unemployed in mid-life. Well, yes, it had occurred to me when my tits were still perky and my mind malleable, so I went to grad school, got a Ph.D. and embarked on what was once a promising and stellar career. But after I found myself in the cross-hairs of those in institutional power, my carefully-constructed career came tumbling down.
Without question, there is an age bias out in the hiring market. Job candidates over 50 (who fall into the Baby Boomer bucket right now) definitely have a few hurdles to overcome. Some valid, some not. Here are some of the reasons that I believe influence companies when considering older job candidates.