What is the ruling on a man shaking hands with an elderly woman when there is no fear of temptation? And what is meant by "no fear of temptation" and how is it achieved?

Scholars have differed regarding the permissibility of shaking hands with an elderly woman when there is no fear of temptation (fitna). The meaning of "no fear of temptation" is not being afraid of falling into what lust calls for. This depends on the woman reaching a stage where she is not typically desired, and on the man being secure from his own inclination towards her. The determination of this is referred to custom. The more cautious approach is to avoid shaking hands, to step out of the disagreement and to prevent encouraging leniency in shaking hands with foreign women.