Baldness: the hair you have at say age 25, you will prob. have that hair for the rest of your life. ie if you are going bald you go bald young. Baldness comes from your mothers’ father - if you are bald, your daughters’ sons are going to be bald too.
That’s a myth. My mother’s father is one of the baldest men I ever knew and I am now close to 32 with zero signs of any hair loss. My brother at 27 has all his hair as well. I have my father’s and grandfather’s hairline, widow’s peak, etc. It may be common to inherit that gene, but it is not a given.