My step daughter will be 7 next month and only started losing her teeth in January. They all seemed to go at once lol. So there is still plenty of time for him.
It's probably a good thing for your son anyway ... My daughter just had her 6th birthday and she tells me that the tooth fairy rates go up when its your birthday (such sneaky moves already for a 6 year old!) - and that it should now leave a pound per tooth.
(also she's only lost 2 teeth so far and they were recent)
Very normal I am a Dental Nurse so I think I know what I am talking about !!!! lol The longer they keep their baby teeth the better for the big teeth.
Hope this puts your mind to rest.
My son has just turned 6, but hasn't got even a slightly wobbly tooth yet. I notice all his school freinds have new teeth through already. Is this normal??