I think this is a problem specific to your library. A very quick check shows the average age of our collection to be about 6 years (at my small to midsized urban library). That's extremely rough because new editions of classics will show a much more recent copyright date than an average person would consider them, so a collection can still be seen to skew much older than the data suggests. However, it's still dominated by recent titles, especially of popular literature. Technical books are harder for me to comment on because at a public library, that's generally out of our domain. We try to keep up on the popular series for tech stuff like "Learn Visually" or "Dummies", but the circulation or those dwindles as either fewer people need them or are more likely to use the internet for solving their problems. Depending on your needs, you might see if your library has a subscription to O'Reilly books or similar platform for your area of interest.
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