Making his mark

There is a pipe in our basement that has names, heights, and the year 1972, marked on it.  That is the year the house was built, so they were probably the first family to live here.  Is Max the shortest person [on record] to live here?

Max liked drawing on the pipe more than standing in front of it to be measured, but  we did manage an accurate height marking.  

Mother-son song along to "Ain't No Mountain High Enough".  Max especially liked throwing himself on the ground for the valley part of the song.