Harry's grandparent's

[lesley]

No: HPFGUIDX 173446

Hi,
This is a question I've been puzzling over from book 1: what happened
to Harry's grandparents? Sirius mentioned that he ran away from home at 16 and stayed with the Potters then (OOTP pg103 UK edition) but within 5 years they must have been dead as James was only 21 when he died and Petunia was Harry's only living relative.

It has never been mentioned how they were killed and all four (including Lily's parents) must have been between the ages of 40-65,  and as wizards generally live naturally to ripe old ages (Dumbledore, Muriel), what happened? Any ideas?

Lesley