I think we should take Spock out of the equation for age of pon farr. There are too many unknowns with him being half human. Add in the artificial growth rate he experienced when being resurrected and you are far from text book Vulcan biology.
I'm wondering now, where
does all this mating take place? If you have a Vulcan couple who already have a 8 year old and an 15 year old surely both parents aren't losing control and screaming and mating and smashing stuff in the home? Or maybe they always send the children away when it hits? Yeah I guess Vulcan kids might grow up with this being a norm, couple other kids coming to stay periodically for a week because their parents are "meditating together".