Why did I pay five insurances, but I found that there were only four insurances in the social security network, and there was no old-age insurance, wasn't it?

Are you asking about the payment of five insurances? One possibility is that the endowment insurance and the other four insurances are not insured by a social security institution. For example, the endowment insurance for employees of provincial enterprises and central enterprises is insured in the provincial social security institutions, and the other four insurances are insured in the municipal social security institutions where the enterprises are located according to the principle of territoriality. Therefore, the payment of endowment insurance can't be found on the municipal social security online, and it should be inquired on the provincial social security online.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.