Age isn’t an issue in terms of driving and as mentioned I think a lot of companies would prefer to employ us “oldie” drivers since we’ve been there, done that, and got many t-shirts. Plus we don’t apparently complain as much as those young upstarts…really not sure where the manager got that idea from! 
Work wise - well you’d need to start off getting your class 2 for the non bendy truck, but there’s quite a bit of work there. A lot will depend on what hours you can work as some jobs are more regulated and others can vary drastically.
Pallet companies aren’t a bad move, maybe not the best paying necessarily at around £9/hour, but they do tend to work relatively sensible hours such as 7am to 5-6pm. A lot of the stuff tends to be forklifted off these days although you do get people wanting stupid things pallet trucked off. Its getting less and less for the heavy stuff as people realise it’s actually quite dangerous and gets them sued.
There’s a possibility of supermarket work, although slightly less so with class 2 but it does exist assuming you’re near a depot. The smaller supermarkets such as coop, NISA, Iceland and such also need stuff shifting and they tend to use more class 2 trucks. Again depends a lot where you are.
I’d probably avoid certain jobs like the steelwork or most construction type jobs since I can tell you from experience, throwing chains over loads in the rain and snow isn’t fun unless you’re a lot more fit than me! Very very glad to be out of that stuff. Plus the hours are daftly long and very early starts.
Getting a start can be fun in this game, but a lot of that is due to insurance and people panicking about new drivers bashing up their trucks. The pallet companies do tend to take on a lot more newer people these days and people like COOP self-insure mostly so they’re not as worried. Once you get your foot in the door it’s much easier, plus age does help it seems.
You’ll find plenty of people around here our age and above, so welcome I’m guessing the 1975 drivers club! Sounds like a dodgy drinking group deep in the heart of parliament! 
PS: You don’t like people and thus no bus job…you’ll fit in sooo well into this job as so many people switch from the darkside too. 