[cbsmith]

This is ridiculous. For starters, in what world is vesting based on value to the employee?

It's also more than a bit ill informed to think that time at a company is less "costly" for an employee the older they are, particularly when it comes to equity. Based on success rates of startups, once you are older you likely only have a few more shots at "winning the lottery", the costs of losing benefits (particularly medical) is higher, and showing forward career progress is so much more crucial. The cost of a few early setbacks is trivial as compared to setbacks towards the end of your career (unless you've already won the lottery, in which case, the discussion is moot).