Hello there. Well done that you got an interview. That's a start that tells you that you know how to get your foot in the door. You're half way there! Now you need to sell yourself, on what you can bring to their surgery. Age is not a barrier, I am a trainee dental nurse, of 52 years old. What the surgeries are looking for is what can you bring that will benefit them: i.e what transferable skills do you have ( 'hands on skills' like telephone skills, IT , paperwork, cash handling, stock control, keeping things clean and tidy, ability to promote products or a service etc) . Then your 'soft skills' and back them up with real life examples, such as how you managed to put an unsure or nervous person at ease, how you contributed to your last organisation, your interests out if work, try and tailor them to work skills, such as doing a first aid certifucate. State what aspects of dentistry interest you and why to demonstrate commitment, and lastly, start looming for and applying for dental nurse courses as you will need to go to on one anyway, and tell them that you are in the process of this. Best if luck.