20 year old male beard growth is slower in my chin area, would minoxidil help cure this problem?

Minoxidil, prp and progesterone can help improve beard growth. I recommend getting a formal evaluation with a hair growth expert. Best, Dr. Emer

Minoxidil can increase the speed and density of hair growth in the beard area. A small study in Thailand using 3% minoxidil confirmed this premise. One must be careful when using minoxidil in the beard area. The same side effects are possible as in the scalp. Minoxidil is a blood pressure medication and has the potential to produce cardiovascular side effects.PRP hair MD.com

It won't cure it but could help. The main thing that will help is time as facial hair reaches a maximum by age 30. If you decide to use it, I advise to do so only under physician supervision. Learn all the risks and benefits.

Many young men want to accelerate their beard growth and ask about it. It takes age (genetic triggers which occur in family lines) so if you want to find out when your beard will grow out, you need to find out when your father or grandfather started to grow their beard. Hormones should have kicked in nicely by the time a man reaches 18 but he must wait out his genetics as hormone alone are not responsible for the onset of beard grown. The drug minoxidil may help.  Beard transplants can be done when the young man is a bit older (over 25) if the beard has not grown in yet