[paraiuspau]

41 years old is also young!

[chakkepolja]

Yes but I think you have enough experience to be not outcompeted in job market by younger people.

[groffee]

..which is the real question you should be asking.

How do 'older' engineers stay upto date and avoid being outcompeted by their 'younger' peers.

Not the question you asked which even if you got answers you won't know if they're fundamentally useful till you're older.