in reality they probably paid in enough to warrant about 5 years of claiming benefits, the rest is being subsidised by the young people that are paying in now and in all likelihood are also renting their properties from them!
should be entitled to any support from the state (and might well be all the things you describe) - but I bet you aren't sending back or planning to send back all the child benefit you have received for your daughter, your state pension, your free tv licence, your winter fuel payment, your free bus pass, etc, etc, etc.
)that people keep banging on about - two birds, one stone, jobs a good un!