Those implanted hairs wont ever recede or die off. Hair behind it will recede further if he chooses not to use Finasteride which blocks DHT which is primary reason alot of sterioid users are prone to hairloss.
Finasteride doesn't work in every case. Due to an enlarged prostate, my urologist prescribed Proscar which is a brand name for Finasteride. It did nothing in terms of growing hair on my head. It may or may not have stalled my having prostate cancer.
The side effects can fuck up a person's sex life causing a loss of interest in sex, impotence, trouble reaching orgasm and ejaculatory issues. Negative side effects which the doctor conveniently neglected to mention. At least I didn't grow tits...another possible side effect.
Finasteride might be warranted when someone suffers benign prostatic hyperplasia. Considering the side effects, taking it to grow hair on your head doesn't seem worth the risk.