I've got a friend who was born with 2 teeth, so its not too early, lol.
Average age is 6 months, but everyone is different.
DS got his first around 7 months, got 6 over the next 2 or so months & thats it. Hasn't had a new tooth in about 8 months.
DD1 got her first at 7 months, had them all including 2yo molars by 13 months.
DD2 got her first at 5.5 months & had all including 2yo molars by 11 months.
A friends DD didn't get her first til 14 months, then they all came in in less than a month.