First find the total number of rings in a ring group: 2 rings + 4 rings = <<2+4=6>>6 rings
Then subtract the number of ring groups in the second tree from the number in the first tree to find the difference: 70 groups - 40 groups = <<70-40=30>>30 groups
Then multiply that number by the number of rings in a group to find the difference in the trees' ages: 30 groups * 6 rings/group = <<6*30=180>>180 rings, or 180 years
#### 180