A few starter concepts to consider:
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Didn't find relevant HN article(s) covering age / creativity and software productivity and why software engineers tend to be under 30.
*** Does Creativity Deline With Age? : https://ogg.osu.edu/media/documents/courses/700.04A/pdf/does_creativity_decline.PDF
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-- Miscelaneous blurbs from recent HN posts about software design to keep in mind:
*** Great scientists follow intuition and beauty, not rationality. : http://www.theintrinsicperspective.com/p/great-scientists-follow-intuition
*** Software Design is Knowledge building: http://olano.dev/blog/software-design-is-knowledge-building/
*** Design leader Dilemma : http://www.smashingmagazine.com/2024/12/the-design-leader-dilemma/
*** On design prototyping : https://medium.com/design-bootcamp/on-design-prototyping-fb655e715f29
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-- Different approach methods:
** Google 20% rule
http://www.cnbc.com/2021/12/16/google-20-percent-rule-shows-exactly-how-much-time-you-should-spend-learning-new-skills.html
** One-on-Ones as way to figure this out
http://hypercontext.com/one-on-one-meeting-guide
http://www.dave-bailey.com/blog/one-on-ones
http://lattice.com/articles/the-ultimate-managers-guide-to-leading-effective-one-on-ones
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Use "google 20% rule" with employee suggested exploratory ideas/topic(s) from one-on-ones.