This cactus is at least 40 years oldenter image description here

  • Good question and illustration; if could include overall height, current watering amount & frequency, current nutrient amount & frequency, and size of container, could also be helpful. We encourage you to browse through the Help center, to learn more about how the site works! Thank you! Welcome to the site! – M H Aug 15 at 14:16

Your cactus is not getting enough direct sunlight, and therefore is etiolating. This means growing thin because of lack of enough sunlight. Because it is so thin it starts to droop, it is not strong enough to hold it owns weight.

Best thing to do is to prune your cactus, I would say keep the lower 1/3 part. And most importantly give it direct sunlight, at least 6 hours per day during spring and summer.

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