If you are not into the realities of plumbing, then perhaps you should arrange to call out the plumber and claim on the house insurance.
I would expect the modern silicone O ring to have a life expectancy of >
30 years in the domestic home. Some of my taps(on pressures up to 4 Bar) using these as shaft seals are at least of this age and the drainage connections are even older. FWIW, I always coat the O rings with Castrol water pump grease before installation and intriguingly enough, none of them have degraded in this time span.
However, I would like to see some figures for the life expectancy of the plastic housings around the O rings in pushfit plumbing, because I have not yet seen a plastic moulding which does not suffer from embrittlement when temperature cycled.
Washing machine washers are AIUI a different material, and apart from fibre, in the past have had a shorter life.
Regards Capitol