Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
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?

### Response:
 Kwa kuwa baada ya miaka mitatu, Tabitha atakuwa na rangi 8 tofauti kwenye nywele zake, mwaka huu ana rangi 8 - 3 = <<8-3=5>>5 kwenye nywele zake.
Kwa kuwa alikuwa na rangi 2 kwenye nywele zake akiwa na umri wa miaka 15, ameongeza rangi 5 - 2 = <<5-2=3>>3 tangu alipokuwa na umri wa miaka 15.
Kwa kuwa anaongeza rangi moja kwa mwaka, rangi 3 zilizoongezwa = <<3=3>>3 miaka iliyongezwa
Hivyo, kwa sasa, ana umri wa miaka 15 + 3 = <<15+3=18>>18.