For many males hair is a concern as they get older, it begins to what, causing a receding hairline?
Options:
- thin out
- grow in ear
- fall out
- bulge
- composted
Let's think now! Step-by-step reasoning:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Fall out means falling out of place. Hair becomes weak as one gets older and falls out.
So, the final answer is fall out.