I personally don't care about an "age appropriate" name if there ever was such a thing. My name that I picked doesn't make the
SSA.gov list of top 1000 names for my birth year. In fact it doesn't make the top 1000 from 1984 to 2008, and peaked in popularity at 65th most popular girls name in 1915, though in a weird bit of strangeness in the last decade it has been in the 500s. This name just "fits" for me, even if it was much more popular in 1885 than 1985.
I would like to point out though, my name is an anagram of my mothers name which hasn't been in the top 1000 since 1962 and peaked at 352 in 1921. It was never a popular name.
The way I see it, having some sort of connection to a name is more important than the statistical data behind it; I mean Jessica Smith would be an incredibly common name for someone of my generation but, that name just wouldn't feel like me.
By the Way, I find the best place to find first name data is
http://www.ssa.gov/OACT/babynames/#ht=2 the SSA will track names for you back to the 1800s if you want, without trying to sell you anything. Of course this data is all based on US Social Security data and might not be 100% accurate (for example I wasn't issued a Social Security number til the 90s because I was born at home with no paperwork filed, and some groups like the Amish opt out of Social Security) but, it can at least be broken down by state, year, etc.
Edit: Just noticed my male birth name was in the 30s in popularity in the 1880s and in the 200s in the 1980s; so I guess I always had an old timey name.