That's pretty low. Been there,,, Look for a frame with a bit more depth, and add a bunkie board under the mattress. Ours is wrapped in a fitted sheet, to match/contrast with the sheet on the mattress. Or get a frame that is just higher. Ikea has several that are adjustable.

But without the bunkie board, it will be annoyingly low. From personal experience.

I would find that low. The nurses at my mothers senior facility placed her adjustable bed at 23" for safe entering and exiting. She is 5' tall. In slippers ;0)

The side rails top on my own bed are 21". Mattress/sleeping height with its feather bed is 32". Some might find that a little high (shaker style 4 poster with side and top rails) but I managed comfortably recovering from hip surgery in that bed, no problems in or out. 5'3".

I've had the same platform bed for at least 20 years, and with the last mattress that I bought, the height of the mattress is 26-1/2", which is higher than I would like, but it does make it easier for me to use the night stand, which is 29" high. My current mattress is 14" high, and I believe my previous one was 10" high, bringing the height down to 22-1/2", which I felt was more ideal.

Benches are frequently 18" high, and they are supposed to be lower than beds, if you have one at the end of the bed.

Thanks for your responses, they are helpful and confirm what I was thinking. I'm also concerned it might be a temptation for my dogs at that height. They're short enough that they don't even consider hopping up on current bed. Also, my linen cover wouldn't work anymore since it's almost too large as it is.