No more Stamina?

So my husband and I used to be able to have sex everyday multiple times a day and it still be some bomb looong sex. Not that we’ve been together for a while sex is not anywhere near as long. Sometimes still as often but we used to be able to go like 3-4 times forever at a time and now it’s like 1-2 really short times. Anyone have this issue and know what’s up? Is it me?