>>76519659
>>76520934
>>76520586
>i got a good 10+ years of back squatting but now i have lower back pain the next day
I'd argue you didn't get good at back squat if you're feeling pain.
You were younger and didn't lift as much weight so you never noticed anything.
Now that your older and lift more you need to actually use proper form.

There's a reason why people say the deadlift and squat are some of the most technical compound lifts.
It's not just your stance and doing the correct motion, but how it feels internally.
Which is hard to figure out because you have to figure it out yourself.

The most common issue I think most people have, while they have the correct stance and do the correct motion, they aren't creating enough tension internally to other parts of the body.
The back squat is a leg move but you need proper tension through the entire body to do them correctly.
Sticking your chest out, flaring your lats, proper core bracing etc. etc.
It should feel like a full body exercise.

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