Turning 50 in November.....
I've been lifting weights 3-4 times a week for donkeys years, nothing too excessive but consistent none the less, I have a few issues, like noisy knee joints, pins and needles in my arms on occasion, minor aches and pains now and then.
I'm sure the positives outweigh the negatives but some times I wonder if I'm getting too old for it and need take up swimming or something instead.......
You need the bone density weightlifting gives you as you age. I'd keep at it but take a good look at the weight you're lifting and form.