As a cycling who is professional, Everyone should learn how to replace the brake line or hydraulic oil.
The oil way is not clean for a long time, which may cause oil way pollution.
For this, your bike may can't be stop, it will be very DANGEROUS.
As a senior cycling enthusiast, I bleed the brake for my bike every year, you can also do this.
As soon as you find that the brakes are not strong enough during the ride or that there is an idle stroke when braking, I highly recommend you to bleed your brake again.