Assuming for the sake of argument that growth was linear to 18 years and stopped thereafter the brown graph approximates what really happened.
A climate "scientist" would say that I have reached the height of 72 inches over 72 years and the alarming trend is that I am growing at 1 inch per year and if I live to be 100 I will be 8 ft 4 inches tall.
Drastic measures will obviously have to be taken to stop the increase in my height! As I do not believe my height is increasing I will obviously be labelled a "denier" from here on.
Note. Interestingly I discovered while writing this that height generally decreases by about .4 inches per decade after 40 and can decrease faster after 70!