I did my only angst phase before I was seven, then kept progressing such that by fifteen people outside of school assumed I was in my twenties. My easy when young sibling went on to be an angsty and troublesome teen.
Understanding, latitude, trust, and communication seem to pay dividends.
When I hear "wait til he's a teenager," I hope my approach is right because at least a case of one says I may be. And wow do I not want to have to eat my words on this.
p.s. when easy going, be sure to communicate early before you pop
