Tamarine Tanasugarn, who made her first Grand Slam quarterfinal two years ago at Wimbledon, just turned 33.
Liezel Huber, 33, has been ranked No.1 in the world in doubles since the year-end rankings in November 2007.
Patty Schnyder, 31, is still a huge threat, just recently beating Top 10 player Agnieszka Radwanska in Madrid.
Nuria Llagostera Vives, who just turned 30 last month, is ranked No.6 in the world in doubles and going very strong.
Kimiko Date Krumm, 39, became the oldest woman to beat a Top 10 player with her French Open win over Dinara Safina.
Cara Black, 31, has the second-most weeks ever at No.1 in doubles, holding that top spot until just a few weeks ago.
Sybille Bammer, who just turned 30, is also one of the mothers in the game, pictured with daughter Tina.
Virginia Ruano Pascual, 36, just won her 43rd career doubles title last week at the Premier tournament in Warsaw.
Rossana de los Rios, 34 and a pro since 1989, is also one of the mothers on tour, with her daughter Ana.
Tathiana Garbin, 32, set her career-high of No.22 in 2007 and is still going strong as she embarks on her 30s.
Kveta Peschke, 34, recently joined up with Katarina Srebotnik to win Indian Wells - her 15th career doubles title.
Jill Craybas, 35, has finished each of the last nine years inside the Top 100 - and is still going strong.
Rennae Stubbs, 38, is still tearing it up on the doubles court - and ranked No.7 in the world in doubles, too.
Lisa Raymond, 36, is still among the top doubles players in the world, currently partnering Rennae Stubbs.
Alberta Brianti, 30, used her pretty one-handed backhand to reach her first career final at Guangzhou last year.