Everything has its expiration date. Even, no especially the things we try to preserve forever.
The food we buy in the supermarket has its expiration date. The relationship we're currently in probably has its expiration date. The jobs we currently do. Everything.
Nothing really lasts forever. Some people even say that love doesn't last forever. I don't know..
So how do you know whether something is approaching its expiration date? Whether the things you do approach their expiration date? Whether you might already be past that expiration date? Whether you're already past the saturation point?
I think the moment you ask yourself this exact same question, you're probably already past your expiration date. That you have to change things. That you have to reinvent yourself. That you have to get rid of the old and start something new..