Early in life it makes sense to move on more easily, not because we value people or partners less, but because we’re still figuring out ourselves and how the world works. There’s just more uncertainty.
Later, when we know more about who we are and what fits, it’s natural to switch less.
In Poland you can get one without doctors referal (for CT you need one because of ionizing radiation exposure), it cost between 100-200$ in normal, reputable hospital (not one like from the street view).