All my Syrians have been female, from pet shops and not been bred.
Syrians:
Holly - 23 months - old age
Honey - 21 months - put to sleep (possible pyometra)
Poppy - 26 months - stroke + old age
Biscuit - 22 months - put to sleep (pyometra)
Russian Dwarfs:
Ginger (M) 1 year - illness, never worked out quite what but some respiratory problem
Rockie (M) 2 years 5 months - old age
I'm actually glad I've sat and thought about it, as for some reason I thought my hammies hadn't been too lucky in regards to their age.