I get the need to do this, and I love Jamie's app to find everyone I need. So I found death dates for 12 people. I made sure 4 people were living. 2 people I am at a loss as to whether they are alive or dead, but are both nearly 100. These were all births before 1930. All the definite under 13 years olds I contacted their parents and asked them to join. This took all day and some of yesterday.
I have 15 people with no birth or death dates. These are going to take some work to track down. And I have all the post 1930s people.
So how much time do I have??? The rest of this is going to take a while.