Yes. 6 years. Six full days. Tamago takes longer.... And the baby comes on day two of marrying. Then stays with parents for another two. Unless you connect marry...then you both get one child for two days and parents leave after those two days.
Marrying another Tama via connection: 24 hours after turning into an adult.
Marrying via dating place or matchmaker: at least 5 on connections but on Tamago it is 6
I hope that helps. Also on the tamago the matchmaker won't come when it turns 6 you will notice a new option on the door Icon. This icon will say dating place. I hope this helps.