Frontal fibrosing alopecia (FFA) is a real possibility to consider, but it is not the only one, and I can't tell from a description alone. Features that make FFA more likely are a hairline that is slowly moving back in a band, loss of the eyebrows, a smooth, pale or shiny skin at the hairline, and tiny red bumps or scale around the remaining hairs. It is more common in women after menopause but can occur in others. The absence of itching, redness and bumps does not exclude it, because some patients have no symptoms at all. The more common causes of temple and hairline thinning are androgenetic alopecia (genetic pattern loss) and traction from tight hairstyles. These show hairs that become thinner and shorter, but the skin looks normal and the follicle openings remain. A dermatologist can tell these apart with a dermatoscope: in FFA, the follicle openings disappear and there may be perifollicular redness or scale, whereas in pattern loss, hair thickness varies but openings remain. If there is doubt, a biopsy settles it. It matters to find out early, because FFA is treated differently and may need anti-inflammatory treatment to stop progression. I would suggest a visit with a hair-focused dermatologist and clear photos of your hairline in good light.