The Older Women Are Slipping

There are now no women born in the 70s in the WTA Top 100, and of the number of women born in the 90s continues to increase while the number of those born in the early-80s continues to decrease.

I have updated my list of top 10 players per birth year, and you can find the link to that page at the right. 
Here is the breakdown of players in the WTA top 100 by birth year:

1980 - 2
1981 - 3
1982 - 7
1983 - 6
1984 - 6
1985 - 9
1986 - 8
1987 - 13
1988 - 8
1989 - 9
1990 - 13
1991 - 9
1992 - 3
1993 - 3
1994 - 1

I have a couple comments about those numbers on the Top 10 by Birth Year page, but feel free to draw your own conclusions and comment if you want.  Here are the 10 players that entered or left the top 100 over the 2 months of play since the week after Wimbledon, which was the last time I ran these stats.

Entering Top 100
54-Magdalena Rybarikova (SVK)
75-Laura Robson (GBR) - first woman born in '94 to enter top 100
80-Casey Dellacqua (AUS)
86-Johanna Larsson (SWE)
88-Coco Vandeweghe (USA)
90-Sesil Karantancheva (KAZ)
91-Lara Arruabarrena-Vecino (ESP)
97-Garbine Muguruza (ESP)
98-Yung-Jan Chan (TPE)
99-Olga Puchkova (RUS)

Leaving Top 100-sorted by age
Kimiko Date-Krumm (JPN)
Greta Arn (HUN)
Mirjana Lucic (CRO)
Elena Baltacha (GBR)
Akgul Amanmuradova (UZB)
Kateryna Bondarenko (UKR)
Vera Dushevina (RUS)
Jarmila Gajdosova (AUS)
Michaella Krajicek (NED)
Irina Falconi (USA)

And if anyone knows somewhere that I can sort the ATP rankings by date of birth, I can do similar stats for the men.