Well that's a problem.
But I believe you're wrong. Lots of startups tackle old problems and succeed.
The best example would be Alan, for health insurance. They're a startup in a traditional field dominated by half-a-century players.
Indy is another example : enterprise accounting is very old. It wasn't industrial, now it is, online.
Decathlon's bikes did destroy old players of this field.
Mistral crushed every French decade-old IT companies in the LLM domain. Etc.