What is the average time to finish a half marathon for a man over 60?

How many years over 50? What is your weight, gender, present fitness level and training status.
I could still run a 1.19 at 50, however at 53 I am now only managing 1.24 at present. (I was 1.15 at 47). After 50 it is more difficult to predict times, the body cannot take the same effort required in training. It is really important to include rest days in one's schedule, it is better to set 1 mile target times and stick to them i.e. 8 mins very mile etc. The most elementary error to make is to not do the training and too start off too quickly.
Best of luck in your challenge, a time of under 2 hours would be considered to be acceptable and suitably challenging and would require 9 minutes per mile.