Have you views on this. We bought a very comfortable pocket spring mattress in the eighties. So it is old but has always been so comfortable. The mattress is turned regularly and we have a topper on top. I cannot feel any springs or anything out of place. It’s the sort of mattress that you long to get back to after a holiday! However, just recently my back aches in the morning (long term back trouble) and I keep seeing adverts saying that you should change your mattress after a few years. Any advice? I know it’s a silly thing to ask but don’t really want to fork out for a new one and risk not getting one as comfortable as this. Welcome input. Thank you.