<human>:  Every year, Tabitha adds a new color to her hair. She started this tradition when she was 15 years old, which was the year she added her second hair color. In three years, Tabitha will have 8 different colors in the hair. Currently, how old is Tabitha?
<bot>: How many colors does Tabitha have in her hair this year? ** Since, three years from now, Tabitha will have 8 different colors in her hair, this year she has 8 - 3 = <<8-3=5>>5 colors in her hair.
How many colors has Tabitha added since she was 15 years old? ** Since she had 2 colors in her hair at the age of 15, she has added 5-2=3 colors since she was 15 years old.
How many years has Tabitha added colors? ** Since she ads one color per year, 3 added colors = <<3=3>>3 added years
How old is Tabitha? ** Thus, currently, she is 15+3=<<15+3=18>>18 years old.
#### 18