He was 59 when he succeeded to the throne and 68 when he died. As has been pointed out he was a heavy smoker and drinker and obese (his favoured exercise was more of the type provided by establishments like Le Chabanais). He'd need to change his lifestyle much earlier to survive a decade more.Edward VII reigned for a short nine years following his mother's six decades in power. What if the son of Queen Victoria, the affable "Uncle of Europe" had had another ten years of life? If he had reigned through the First World War?
But, hey, he could have changed. The obvious consequences are the changes to:
1. The British constitutional crisis of 1910.
2. The beginning of the Great War
3. The question of Home Rule for Ireland[1].
In general Edward was very popular and quite liberal for the time.
[1] And also Scotland.