Hi there! Be sure to check out their website for job openings, reach out to people through LinkedIn who work for the company and invite them to coffee, maybe they know about job postings that aren't on the site or can connect you with HR. Also, I would write I highly enticing email about your experience and how you want to join their company in particular because you believe in the future of their company and send it to Mark Zuckerberg. It doesn't matter how old you are it is about the drive within you. They may be looking for someone who is older and more experienced in the world sense than the marketing side and get a fresh perspective from someone your age. Age is just a number! Let me know if you want to further brainstorm ideas of how you can achieve your dream!