That would probably depend on:
You need to renew it or you could have a tough time getting legitimate employment.
If you left Denmark 30 years ago and you still hold the Danish citizenship, then you can renew your residence permit.
Yes, El Salvador allows dual citizenship. Just renew your Salvadoran passport, if you haven't, and you are good to go.
by going to the bank and ask to renew it
2
You never need to renew your certification card. Its lifetime
In Georgia you never have to renew your education card.
Not for applying for citizenship. But when they check your documents on the test date and the citizenship ceremony, you will need to show them a valid passport. So, it is better to apply for one now.
You never have to renew your Massachusetts boater education card
Depending on your insurance company most policy's renew automatically every 6 months.
3 years
If you're in the US, no.