Social skills developed (3 yrs ++ )

I have read some articles as well as attended seminar about parenting that social skills are developed naturally when kid's age around 3 years old. Of course if parents want to push the kid to have social skill faster it could be done, by sending them in school earlier but so what ???

So I let him grow and develop the skill naturally and it's beautiful to see the nature takes course
When I or his daddy bring him to playground, he will prefer to play with other kids, and like in this occasion when he brought his bike into playground, he made friend with older kids and in response the older kid help him to learn bike. And for few minutes only, he could ride bike on his own..The power of peer learning !