Verbatim response from Perplexity
It is too late to treat hair loss with standard regrowth medications when the follicles are no longer active—typically when the scalp is smooth, shiny, and lacks any thin or peach-fuzz hairs. If follicles are still miniaturized but alive, treatment is often still worth trying, and the earlier you start, the better the odds of regrowth.[1][2][14]
What “too late” means depends on the cause:
- Male/female pattern hair loss: not usually too late unless the follicles have become permanently inactive or scarred over; minoxidil works best while follicles are still active.[2][7][11]
- Scarring alopecia: often becomes permanent once follicles are destroyed, so this needs early dermatology evaluation.[9][13]
- Traction or other reversible hair loss: may still improve if the damaging trigger is stopped and treated early.[4]
Signs it may be past the point of meaningful regrowth with medication:
- Completely bald, smooth scalp
- No visible vellus hairs or stubble
- Shiny areas suggesting follicle loss or scarring
- Hair loss has been present for years without treatment, especially with advanced thinning[2][7][11]
Even in advanced cases, it may not be too late to slow further loss or consider a hair transplant if donor hair is still available.[8][11]
If you want, I can also give you a simple “too late vs still treatable” checklist by hair-loss type.