hi smiley!..if age is your talking about, for me 25-28 for ladies and 30-35 for men, but if your are ready to get married even your still in early 20's why not as long you can carry all the bills...
I am thinking 18 to 118.
If you want to have kids, then do that earlier on, while younger.
Many people never find their match until much later in life.
When someone decides it is the thing to do is when it is correct.
