The reason for the slight difference in dating is the imbalance in the population in Russia; due to sheer lack of men it is simply harder to find a husband for Russian brides or Russian women.
In some cases in Russia one can find a woman much younger partner for dating but remember, the greater your age difference, the less the chances of your marriage surviving and more chances of getting married to someone who has no feelings for you, but plenty of financial plans...
The cost of premium membership is far lower than most other Russian, Polish or Bulgarian marriage and dating agencies or so called “dating mail order brides” dating services.
If you are looking for a younger woman to date try and keep the age difference between you to no more than 13 years for Bulgarian ladies and 16 years for Russian ladies.
That makes it much easier to meet so called “East European brides" in person rather than pay hundreds of euros to russian marriage agencies for translations of letters and costly trips.