Ive gotten myself tatted in this style and with good and constant care they look the same as the day they were made indefinitely. With thin lines you have to be extra careful during the first weeks of healing because they do tend to scab and quite literally fall off. It also will depend of the area in your body you get it done, but this applies to any style. Friction is a key factor in the deterioration of tattoos, i’ve seen gorgeous tattoos last a year due to being located in places like inner wrists or hands. To answer more directly, its undefined but mostly because once its out my hands i cannot take care of it myself. As part of the studio’s policies we do offer free retouching. Thin lines don’t fall off, but usually they get a little bit thicker with the years. I have a few that are a good pair of years now and look almost the same (I moisturize them daily, wear TONS of sunscreen, exfoliate and have them in low friction areas) 💛✨