If you're coming up on 40 you should know a lot of people. You should have a work history so ridiculously long you need to omit 75% of it to fit it on a two page resume. You should know the business, which companies are succeeding, which are failing, and what problems are most interesting to you.

This is a huge advantage compared to some recent graduate that has no idea, knows nobody, and is still learning the geography of the industry.

Don't stop learning. Don't stop making contacts, friends, and other connections. At some point you won't need a resume to get a job, you'll just need to know who to call.