Absolutely, brown mascara is suitable for all ages. The choice of mascara color is more about personal preference, skin tone, hair color, and the look you want to achieve rather than age.

Brown mascara can give a softer, more natural look compared to black mascara, which can sometimes appear too harsh, especially on fair skin tones or lighter hair colors. It's also a great choice for a daytime or casual look.

However, it's important to note that the formulation of the mascara is just as important as the color. Look for mascaras that are ophthalmologist-tested, especially if you wear contact lenses or have sensitive eyes. Also, consider the mascara's ingredients. Some mascaras contain nourishing ingredients that can help condition and strengthen your lashes.

In terms of age, as we grow older, our lashes can become thinner and more brittle. Therefore, it's beneficial to use a mascara that contains ingredients like peptides and panthenol, which can help to promote lash health and growth.

In conclusion, brown mascara can be a great choice for all ages. It's all about finding the right formulation and shade that works best for you.