I am a farmer in Jinzhou, married in Dalian, and I am 42 years old this year. Can I pay social security?

Yes, if your economic conditions are ok, you can choose to go to the social security bureau in your city as a flexible employee to participate in the endowment insurance for urban workers. If you have poor economic conditions, you can participate in the new rural insurance (now it should be urban and rural residents' insurance). The former will pay more money, but you will get more pension in the future.

As for Jinzhou and Dalian, if you have settled or worked in Dalian, you can pay in Dalian. The new rural insurance will limit your hukou, but for urban workers, no matter where your hukou is, your working relationship can be insured in Dalian.