Answer first
Hair needs change with age: teens often deal with oil and dandruff, adults in their twenties to forties with early thinning and stress shedding, women around pregnancy and menopause with hormonal shifts, and older adults with finer, drier hair. A gentle routine adjusted to each stage, plus a doctor's check when changes are sudden, serves every age.
Teens and twenties
Regular washing for oil, gentle styling, and early advice if thinning runs in the family.
Thirties to fifties
Stress, pregnancy, menopause and health changes; check iron and thyroid when needed.
Sixties and beyond
Finer, drier hair; moisturising care and sun protection for the scalp.
Questions
Is it too late to start?
No; at any age a healthier scalp and a sensible routine help.
Are your products for teens?
Check each label and ask a doctor for under-18s before using minoxidil products.