We just moved into this house in late December. I mowed the lawn for the first time this month and noticed walnut shells under three trees. These are black inside -no nutmeat at all. Some are still in a black husk. I would say between the three trees that I believe are walnut there are maybe 2 doz husks or broken nuts. Two of the trees are about 36-50" around the trunk and are very tall, well over 50' the third tree is much smaller - 20-25" around, shorter, and many more branches. approx 25' tall. First, there is grass growing under them.
Second, after determining what type they are, how can I tell their age?