If you accept number of developers has roughly doubled every ~5 years since the 1950s, then then simple result of that is that at any point since then half the active developers have 5 years or more experience, 1/4 have 10 years or more, 1/8 have 15 years or more etc.
Combine that with the the age at which someone becomes a developer (mostly younger), the tendency for experienced devs to move to management|consultants|speakers|writers, older devs to retire etc. then there are probably only 1 in 500 developers with 30+ years experience
Compound that with the self selection of choosing jobs where you work with your peers, which seems to be echoed in some of the other comments, then the less frequent older developers seem to cluster in the same companies, it would be quite possible for some younger devs to have never crossed paths with them
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If you accept number of developers has roughly doubled every ~5 years since the 1950s, then then simple result of that is that at any point since then half the active developers have 5 years or more experience, 1/4 have 10 years or more, 1/8 have 15 years or more etc.
Combine that with the the age at which someone becomes a developer (mostly younger), the tendency for experienced devs to move to management|consultants|speakers|writers, older devs to retire etc. then there are probably only 1 in 500 developers with 30+ years experience
Compound that with the self selection of choosing jobs where you work with your peers, which seems to be echoed in some of the other comments, then the less frequent older developers seem to cluster in the same companies, it would be quite possible for some younger devs to have never crossed paths with them