[Nursie]

I've met those guys.

The 50-something who had been in the same role 37 years, who was laid off and when hired into a new company, just couldn't adapt. The 40-something who's fine to do maintenance and the odd enhancement, but you wouldn't trust to do a major refactor or a large chunk of green-field.

Some people just aren't as able, find themselves a comfort zone and stick to it.

So even experience doesn't necessarily mean experience :)

(This isn't to say such people aren't useful, that's a different measure.)