which industry? I assume you mean development / programming. How old are you and why do you think 25 at most? I'm 35 and plan on doing this until I'm dead. There is absolutely no reason that you ever have to give up programming (outside of dementia).

I've met blind programmers and programmers that can't use their hands. If they can do it, we can do it, even if we have arthritis and become legally blind.

Edit: also if i become unemployable due to ageism, i've alrady decided will create a persona online of a 30 year old and only take remote jobs.