The MatchMaker doesn't always come at a specific time. <_< It always depends on how ready Your Tamagotchi is. The MatchMaker "USUALLY" come at the ages 6-9, ( like *~Tamagotchi~* has stated).
Your tamagotchi has to be an adult for a minimum of 24 hours before it can mate to another tama adult. Tamas are allowed another 24 to 48 hours to find a mate before the matchmaker starts appearing. It all depends on WHEN your tama evolved. The Matchmaker can start coming as early as age 6 and will continue to come as late as age 11. She will visit 3 times a day; 10:30am, 3pm, and 7pm.