Put another way, an OR of 1.5 means that by the time half of a hypothetical sample of 100 people has died, there will be five more people alive with stronger social relationships than people with weaker social relationships.
http://plosmedicine.org/article/info:doi/10.1371/journal.pmed.1000316#article1.front1.article-meta1.abstract3.sec3.p1

Rather than five more alive, I believe this should read, "there will be ten more people alive with stronger social relationships than people with weaker social relationships."

If this sample of 100 people is made up of 50 people with "stronger social relationships" and 50 people with "weaker social relationships," and half of the total sample stays alive, with a 50% higher survival rate in the strong relationships group, then we can conclude that 30 out of 50 people with stronger relationships stayed alive and 20 out of 50 people with weaker relationships stayed alive.

Calculations:
Strong relationships survival rate = 60%
Weak relationships survival rate = 40%
This satisfies the requirement that there be a 50% higher survival rate in the strong relationships group: 60%/40% = 1.5

Strong relationships survival = 60% * 50 = 30
Weak relationships survival = 40% * 50 = 20
Total surviving = 20 + 30 = 50 = 50%
This satisfies the requirement that half the total sample dies.