Age eventually catches up with all footballers - and some of European football's biggest names are currently in the early stages of decline.
Others are a little further down the line, and don't have long left at the top level. Some may even be forced to leave their current clubs, or leagues, altogether this summer.
This list contains ten high-profile who are all in decline. Add your suggestions in the comment section below - and tell us whether you agree or disagree with the selections.