Maturing hairline or receding hairline? How do I fix this? (photos)

Long story short the only MPB i have in my family is my dad. who has formed the so called "island look". my dads father has lost most of the temples but still has his hair in his late 70s. My mothers side, all the men have full heads of hair still into their middle and old ages. i am noticing a quite RAPID recession and want to know if i should seek a dermatologist, or get over it. as losing my hair is something that quite scares me. thank you for your help. I also take 5,000 mcg of biotin daily