Hey, everyone. I have a problem for you to solve. I tried but don't know how to complete it. Here is the problem:

"My grandson is about as many days as my son is weeks, and my grandson is as many months as I am in years. My grandson, my son, and I are 140 years. Can you tell me my age in years?"

So that's what the problem said. If there are any answers, I'll gladly accept them. Thanks in advance!