36 years, count 5 years to become proficient, it remains something like 25 years to enjoy your new expertise. On the other hand, if it's for starting a company

36 years, count 5 years to become proficient, it remains something like 25 years to enjoy your new expertise. On the other hand, if it's for starting a company, perhaps that your skills would be better used elsewhere than in learning a full new world, and so taking a developer with you may be the best.