Let me put it another way.
Where would you be today if you went back to school 4 years ago?
Tucker,

Acquaintance's Hubby is a skilled auto mechanic, Problem is he is nearing 50 and for the last 20 years the wife has begged him to get training in all the new computers and the analyzing divices on the market.
He has had all kinds of training and schools in his field 30 years ago-----BUT--he is so far from todays technology he has a huge problem getting work. He is in fear of technology and now finds he has to compete with kids that are well under half his age.
Poor guy, his Mother left him money in her will to be used just to go back to school so far for 10 years he has not touched it. He is afraid of all the new stuff, afraid he is not smart enough to grasp new inventions and how they work.
So this man at 50 is now working at rotating tires, changing head or tail lights and replacing blown fuses, he is called in to a shop to work when a highschool kid calls in sick. He works on the old clunkers for friends part time, but damn he passed up an education where he could make big money at and do for the next 20 years, now down to 15 or more.
There is no limit on age to become educated for a good job or just for fun and a hobby. The biggest hurdle is laziness and getting set in your ways. Wife works 2 jobs and keeps one in their boy toys, why bother to get off the sofa and attend classes, long as you are bringing in enough money to keep wife off your back--------Time comes when you are out dated and realise that life has passed you by. Depression sets in, self hate for not taking advantage of an opportunity that one must blame on others, it is all ways someones Else's fault or you go Nuts.
Regrets are much harder to face from the things we did to the things we never did.
Go back to school for any reason, earning power or just for a new interest that will open doors to you.
Community colleges have classes for 70-80+ adults to explore their world. At mid 40's you are still a young fella, Get out by on line or spend a few nights at a Community college or even a Highschool that offers very cheap classes in something, anything that interests you.
All about net working, the more people you know with like interests the better off you are at any age.
Best benifit is you may find you are much better in a different field, the old life style and job may not have been what you were born to do.