Yes, this is true. For instance, the periodic annual increment in a western Oregon douglas fir forest peaks around forty years, and if each year you average th

Yes, this is true. For instance, the periodic annual increment in a western Oregon douglas fir forest peaks around forty years, and if each year you average the annual growth of all preceding years, the mean annual increment peaks somewhere between 60 and 80 years depending on site class. I only mean to suggest that regrowing a 40 year old stand takes 40 years.