I'd had the pleasure of answering kids in the 'why' stage before having kids of my own. And resolved to face my own kids with answers whenever I could.

I'm not sure it has been successful, they never really exhausted my ability to answer but I fear it may have sucked out some of the magic - not having answers might be 'better' to some extent if your aim is to foster curiosity and personal goal fulfillment.

My kids are awesome and definitely have some intrigue; but perhaps endeavour to not provide answers!