Apple I Mac Certificates?

Apple I mac users: I have a question and concern. Can you enlighten me?

I have troubles adding my wireless printers to my network. But that is not the problem.

I found out the following on my iMac

when you go to finder, utilities, key access chain

you go under your net work

and you see that your MacSharing Certificate has expired Nov 17,2009

the same is with Apple Code Signing Certification Authority

Expired Saturday Feb 13,2015

The other certificates, I asume running your I Mac programs are all running out in the nearby future!

My Question to you, is Apple doing this on purpose , so that consumers have to purchase new Apple I Macs? Have you expierenced certain things on your I Mac not working any more? Why would every time I connect or print my printer document, it would say printer off line? HELP!

Please all of you that have Apple I MACS go through your system look up your certificates and tell me what you think?

Our I Mac is only 5 years old?