I remember an industry teacher once saying to me that "You'll probably never put '10 years experience in Technology X' on a CV." because by the time it's been around for that long it will be pretty much obsolete. The fundamentals of computer science won't change (big-O, synchronised distributed systems, logic etc.) so I suppose it will just come down to re-learning the modern day tech.

But that's the same for lawyers (fundamental laws / processes unchanged, need to be up-to-date on modern rulings and changes), doctors (fundamental human physiology unchanged, need to be up-to-date on modern techniques and drugs) sales assistants (knowing how to greet and assist a member of the public never changes, need to know how to use the latest cash register / Square-up card reader terminal).

I suppose you can't escape it in another industry. I still stand by my point that your skillset as you get older will make you more appropriate for other duties.