Ok, first thing would be, as long as you’re willing to learn, age doesn’t matter – it’s just a number. Learning is a long process that’s very hard, but it’s always worth it at the end. So you have to keep going regardless of how hard it is!!
When you first start off with any instrument, it’s very useful to have someone who has really good ears and can help tell you what they hear. It’s always useful to find a teacher because they can always give you extremely useful tips.
Some advice I would give is always warm up, no matter what instrument it is, ALWAYS WARM UP because for your voice, it’s very damaging if you don’t warm up, whereas for instruments, doing little warm up exercises will strengthen the areas needed for the specific instrument. It will really pay off later on when you learn to play harder stuff.
and of course, Have Fun!!