The trip was comfortable for me and my elderly parents. Driver Ashaari was responsive, friendly, punctual and an expert navigator! He also knows the place well and we had a pleasant time with him on the drive up and down Cameron Highlands and back to KL.
One note about the Mossy forest though. It's not very suitable for the elderly if they have weak knees as the steps are high and could be slippery due to the moisture. I only found out after I bought the tickets at the entrance to the park.