Darcy = 2*Dexter = 2*8 = 16
Last year Darcy was 16 - 1 = <<16-1=15>>15
Dallas was 3 times Darcy last year = 3*15 = <<3*15=45>>45
Dallas is a year older now = 45 + 1 = <<45+1=46>>46
Dallas is 46 years old now.
#### 46