If your company has a head of diversity, your company is bloated and this person isn't going to fix diversity. I view these strictly as PR positions because I have yet to see anything useful come out of them.
Hello?
https://news.ycombinator.com/item?id=12454634
https://news.ycombinator.com/item?id=9497721
https://news.ycombinator.com/item?id=10412284
https://news.ycombinator.com/item?id=9086689
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As for whether or not it's easier or harder than being young, who knows. Isn't being younger an advantage in getting almost any job?
It's sort of similar to hiring a "head of profit". Profit, like diversity, is the outcome of the entire company's operations.