Your beard is not at all atypical for your age. Yes, there are those beard gods of 18 who skipped shaving one morning, and somehow were sporting full, thick, epic beards by that evening; but most of us have beards that came in more slowly.

Mine started under my jaw and on my neck, then gradually moved up my face and cheeks through my mid20's. It continued to fill in during my 30's. I just kept it trimmed and shaped to emphasize the areas along my chin and jaw where it was the fullest while the cheek area developed.

Yours is coming in. Don't get discouraged.