18 + 4 + 10 = 32

You actually have 18 years of experience, making you 40 years of age, and you're listing only the most recent ~10 years. They have no practical means to accurately figure out your age from that resume. The best it can do is slightly help you avoid the first layer of age-based screening.

You shouldn’t list your entire career on your resume, just the past 10-15 years. Also, assuming “18 + length of schooling” is bad too. You’d be way off on my age then too (I graduated HS several years early).

> Also, assuming “18 + length of schooling” is bad too.

That does not mean that it doesn't happen. I mean, we already established that we're dealing with short-sighted people here.

> That does not mean that it doesn't happen.

Never said it doesn’t happen, I know it does. I simply stated it’s a very flawed approach and gave one example of why.