Our best source of the how to of staying eternally young is to watch the young Toddlers have a lot to teach us about how to stay creative forever.
1) THERE IS ALWAYS MORE THAN ONE SOLUTION
The more difficult the problem you need to solve, the more you need to let yourself go crazy with imagined solutions, the more improbable, impossible and fanciful the more you will relax, have fun and just like magic the practical solution will present itself.
It is almost as if the only way you can coax sense out of nonsense is to join in on the nonsense. Anyone who has had to explain sense to a toddler knows of this technique.
Once the sensible solution has presented itself. Challenge it. Just like a toddler does.