I am 32 at the moment and been working since I was 17. Never really had back problems in the beginning... AT LEAST I THOUGHT SO!
About 2 years into working, remember I was an apprentice and got all the crappy work of lifting things and so on, I lifted something that wasn't overly heavy (it's a while ago but guessing about 40kg) and landed up actually stuck in a crouched position because I couldn't move from the pain. Off to the doc and got a injection in my butt and it felt better. At the time I played quite a bit of soccer and after about a week it felt like I had really damaged my hamstring somehow on the field. I could walk and run but every time I lifted my leg it felt like someone was stabbing me in my hamstring. Worked through the pain for about a month and a half till I eventually went back to the doc. Went for the butt injection DAILY and they sent me for all forms of tests,even a very weird shock thing that looks at nerve reaction, and they figured out that I had a bit of scoliosis that was in fact causing the leg pain and also my back pain because the nerves were getting crunched up every time I over exerted my back.
Doc told me that I had to take it easy and start learning how to lift things properly and stand properly as not to put strain on the affected areas. Also suggested a line of work that would put less strain on it. I wasn't willing to change careers since I had actually only then started enjoying it. When behind a machine I figured out that standing cross legged putting more stress on one side of my back actually does wonders so I have continued that way even though people often look at me with a weird look on their face. When lifting things I can lift just as much if not more than the guy next to me but I have learnt techniques that don't put strain on my back. When stretching over, I have one machining centre where the table if pretty far forward and is a bitch to set with my back, I have learnt to immediately feel when I am over straining areas that I shouldn't and compensate or get something nearby to stand on, I am 6ft 6' but sometimes being taller really doesn't help the situation. I played soccer still for years but since giving it up about two years ago it has also helped because I think the hard pressure when running was maybe causing more trouble. I just go to the gym twice a week now and guess what... It has helped strengthening certain muscles putting less strain on my back.
Probably once every 6-9 months or so I do something stupid and have a bit of a problem. I feel it immediately and get angry with myself. I then know that I am in for a few days of anti inflammatory tablets, I agree with the try to stay away from pain killers and only use them as a last resort, and sleeping on the floor to get things back on track but I have learnt to live with it.
Yeah the back pain sucks but if you work smarter then you can avoid a lot of trouble. It's that "Oh I will quickly lift this, it won't hurt" or "My back feels tender but let me just take one more cut on the lathe before I take a walk to stretch it out" that messes you up. In the end it is purely your own choice but you need to know that you will get sore from time to time and get dead legs or arms, I really hope for your sake not but that's the way mine pans out, and decide if you want to deal with it. I would still make the same decision as I did back then but I should have done more aggressive research in relation to taking strain off my back and how to strengthen areas that would help me out. But to each their own... Good luck!