If you've had full electro, T won't give a full beard.
I had electro a long time before HRT and had no beard at all,
once a year I had to remove with electro
about 10 fine slightly dark hair,
but that's all. That went on for 7 years.
Its possible that person had little hair at 18, though I'd be surprised
there was none if he has a full beard now.
For me, it sounds like he had SRS before electro, which many people
do, which I find a bit incredible but hey, its their lives.