She can earn up to 4 credits per year. That means that your wife can earn one credit for each 1360$ of wages (as in 2019) or self-employment income.
Do you want to know more about the credits per year?
Yes, please.
So, as I said, is 1 credit for every 1360$ she earns so she'd get her fourth credit when she has earned 5440$ and that would complete her 4 credits per year.
What if I marry after I've reached the age of 60?
your new marriage will not affect your eligibility for survivor benefits
very well. Now for DEA Survivors and Dependents Educational Assistance Program Am I Eligible for Educational Benefits?
If you do not meet the legal definition of blindness ,  you may still qualify for disability benefits if your vision problems alone or combined with other health problems prevent you from working
I'd like to know if my parents are eligible to receive Social Security Survivor benefits?
Are you the dependent parent?
No, I was just curious.
Unfortunately, no relevant information is found.
How many credits are needed to provide benefits for survivors?
That depends on the age of the workers the moment they die. But, no one needs more than 40 credits in 10 years of work to be eligible for any Social Security benefit.
Have any of your family members died recently?