I wasn’t going to give my anecdote because everyone is different, but …
I had loads of big wavy hair when it wasn’t in style. I couldn’t use a comb – just a wide-toothed pick. Then, in my late 50s, when I had hair halfway down my back, I decided to brush my hair for a job interview. Bad idea. Half the hairs broke off partway, and the others stayed the same length. Terrible!
It kept breaking off and wouldn’t grow. I trimmed it every few months, but that didn’t help; it just meant I always had short hair.
I read that coconut oil would help. So every 2 days, before washing my hair, I’d put coconut oil on my head, cover it with a plastic cap, and leave it on for a couple of hours. I did this for a few years, but it didn’t help.
Also I read labels carefully and avoided all products containing silicone (anything that ends in -cone).
Then I read that coconut oil can be bad for certain kinds of hair. So I stopped using it.
Next, I read about mixing coffee with shampoo. I use about 1 Tablespoon of instant coffee per 500 ml (2 cups) of shampoo. It works! I’m 68 and my hair doesn’t look great, but at least it’s long enough to pull back into a ponytail or an updo, which are my only options for tidy looking hair.