Hi Hayley!
Glad to hear you're interested in such a great instrument!
I too am a late starter with viola. In fact, I started on 1 Feb this year. No need to worry about age - I'm 35!!
It isn't easy to learn, no two ways about it, but it is fun. You don't screech as much as you could on a violin's E-string, so there's that to look forward to. As long as you bow in the right place, about halfway between the fingerboard and the bridge and keep your bow arm wrist nice and relaxed, you won't make an awful noise. My biggest challenge is getting the notes in the right place! I'm often sharp with my first finger and, since starting 4th finger, my 3rd doesn't want to be parted from it and that's getting sharp too, but it's all part of the rich tapestry of learning.
Oh, the upper strings beginners' thread is on this forum, not the adult learners' one and needs someone to post to it to bring it back to first page! I will go and do that straight away!!!
GO FOR IT!