text: It's unlikely that Peter was an older man or a man of advanced age. 
  
  It's thought that Jesus' ministry lasted for around 3 to 3 /1/2 years, starting at age 30. His travels throughout Israel were conducted largely on foot with no settled home or base of his own.  Therefore, his disciples would have had to have been of a similar age, or quite likely slightly younger. This was a physically demanding lifestyle and to postulate that Peter was at that time "a man of advanced age" is extremely unlikely. In that time period, men who were in their 50's-60's just wouldn't have been up to traipsing all over the country, back and forth on journeys of as much as 100 miles.  
  
  Furthermore, even if we said that Peter was in his mid-50's when he accompanied Jesus, he definitely didn't end his own ministry at the same time as Jesus. Peter continued on as an active   Apostle until 64-68 AD when he met his death through martyrdom, making it improbable that he was around 60 when he started this mission.