Hi,
I just started a week or so ago myself and I am only a few years older. You will need a 4/4 (this is the adult size)Having played the Saxophone for a number of years I wanted to try a 2nd instrument (Violin), so after a bit of advice I got in touch with Liz Ward at Elida Trading
http://www.elidatrading.co.uk/ purchased my Violin (Gigla Gems) and so far I am enjoying every minute of it.
All I can say is go for it, I am sure you will not be dissapointed.
Regards
Darren