My parents are senior citizens and are traveling on Lufthansa and will be changing planes.

They have 1 hour and 35 minutes between flights and have not been to the airport.

Are there any tips to make navigating the airport easier?

They are arriving at gate Z66 and departing gate C17.

I will be giving them the map below.

Specific questions:

In order to get from Z66 to C17 do they need to take the Transfer Tunnel shown on the map or is there a faster way?

What if they arrive at gate B21 and need to get to C17. There are two routes to take. Are any of the security check points faster than others?

http://www.frankfurt-airport.com/con.../t1t2_0914.pdf